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----
-layout: docs
-title: Grid system
-description: Use our powerful mobile-first flexbox grid to build layouts of all shapes and sizes thanks to a twelve column system, five default responsive tiers, Sass variables and mixins, and dozens of predefined classes.
-group: layout
-toc: true
----
-
-## How it works
-
-Bootstrap's grid system uses a series of containers, rows, and columns to layout and align content. It's built with flexbox and is fully responsive. Below is an example and an in-depth look at how the grid comes together.
-
-<div class="bd-example bd-example-row">
-<div class="container">
-  <div class="row">
-    <div class="col-sm">
-      One of three columns
-    </div>
-    <div class="col-sm">
-      One of three columns
-    </div>
-    <div class="col-sm">
-      One of three columns
-    </div>
-  </div>
-</div>
-</div>
-
-The above example creates three equal-width columns on small, medium, large, and extra large devices using our predefined grid classes. Those columns are centered in the page with the parent `.container`.
-
-Breaking it down, here's how it works:
-
-- Containers provide a means to center your site's contents. Use `.container` for fixed width or `.container-fluid` for full width.
-- Rows are horizontal groups of columns that ensure your columns are lined up properly. We use the negative margin method on `.row` to ensure all your content is aligned properly down the left side.
-- Content should be placed within columns, and only columns may be immediate children of rows.
-- Thanks to flexbox, grid columns without a set width will automatically layout with equal widths. For example, four instances of `.col-sm` will each automatically be 25% wide for small breakpoints.
-- Column classes indicate the number of columns you'd like to use out of the possible 12 per row. So, if you want three equal-width columns, you can use `.col-sm-4`.
-- Column `width`s are set in percentages, so they're always fluid and sized relative to their parent element.
-- Columns have horizontal `padding` to create the gutters between individual columns, however, you can remove the `margin` from rows and `padding` from columns with `.no-gutters` on the `.row`.
-- There are five grid tiers, one for each [responsive breakpoint]({{ site.baseurl }}/layout/overview/#responsive-breakpoints): all breakpoints (extra small), small, medium, large, and extra large.
-- Grid tiers are based on minimum widths, meaning they apply to that one tier and all those above it (e.g., `.col-sm-4` applies to small, medium, large, and extra large devices).
-- You can use predefined grid classes or Sass mixins for more semantic markup.
-
-Be aware of the limitations and [bugs around flexbox](https://github.com/philipwalton/flexbugs), like the [inability to use some HTML elements as flex containers](https://github.com/philipwalton/flexbugs#9-some-html-elements-cant-be-flex-containers).
-
-Sounds good? Great, let's move on to seeing all that in an example.
-
-## Grid options
-
-While Bootstrap uses `em`s or `rem`s for defining most sizes, `px`s are used for grid breakpoints and container widths. This is because the viewport width is in pixels and does not change with the [font size](https://drafts.csswg.org/mediaqueries-3/#units).
-
-See how aspects of the Bootstrap grid system work across multiple devices with a handy table.
-
-<table class="table table-bordered table-striped table-responsive">
-  <thead>
-    <tr>
-      <th></th>
-      <th class="text-center">
-        Extra small<br>
-        <small>&lt;576px</small>
-      </th>
-      <th class="text-center">
-        Small<br>
-        <small>&ge;576px</small>
-      </th>
-      <th class="text-center">
-        Medium<br>
-        <small>&ge;768px</small>
-      </th>
-      <th class="text-center">
-        Large<br>
-        <small>&ge;992px</small>
-      </th>
-      <th class="text-center">
-        Extra large<br>
-        <small>&ge;1200px</small>
-      </th>
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <th class="text-nowrap" scope="row">Grid behavior</th>
-      <td>Horizontal at all times</td>
-      <td colspan="4">Collapsed to start, horizontal above breakpoints</td>
-    </tr>
-    <tr>
-      <th class="text-nowrap" scope="row">Max container width</th>
-      <td>None (auto)</td>
-      <td>540px</td>
-      <td>720px</td>
-      <td>960px</td>
-      <td>1140px</td>
-    </tr>
-    <tr>
-      <th class="text-nowrap" scope="row">Class prefix</th>
-      <td><code>.col-</code></td>
-      <td><code>.col-sm-</code></td>
-      <td><code>.col-md-</code></td>
-      <td><code>.col-lg-</code></td>
-      <td><code>.col-xl-</code></td>
-    </tr>
-    <tr>
-      <th class="text-nowrap" scope="row"># of columns</th>
-      <td colspan="5">12</td>
-    </tr>
-    <tr>
-      <th class="text-nowrap" scope="row">Gutter width</th>
-      <td colspan="5">30px (15px on each side of a column)</td>
-    </tr>
-    <tr>
-      <th class="text-nowrap" scope="row">Nestable</th>
-      <td colspan="5">Yes</td>
-    </tr>
-    <tr>
-      <th class="text-nowrap" scope="row">Offsets</th>
-      <td colspan="5">Yes</td>
-    </tr>
-    <tr>
-      <th class="text-nowrap" scope="row">Column ordering</th>
-      <td colspan="5">Yes</td>
-    </tr>
-  </tbody>
-</table>
-
-## Auto-layout columns
-
-Utilize breakpoint-specific column classes for easy column sizing without an explicit numbered class like `.col-sm-6`.
-
-### Equal-width
-
-For example, here are two grid layouts that apply to every device and viewport, from `xs` to `xl`. Add any number of unit-less classes for each breakpoint you need and every column will be the same width.
-
-<div class="bd-example-row">
-{% example html %}
-<div class="container">
-  <div class="row">
-    <div class="col">
-      1 of 2
-    </div>
-    <div class="col">
-      2 of 2
-    </div>
-  </div>
-  <div class="row">
-    <div class="col">
-      1 of 3
-    </div>
-    <div class="col">
-      2 of 3
-    </div>
-    <div class="col">
-      3 of 3
-    </div>
-  </div>
-</div>
-{% endexample %}
-</div>
-
-Equal-width columns can be broken into multiple lines, but there is a [Safari flexbox bug](https://github.com/philipwalton/flexbugs#11-min-and-max-size-declarations-are-ignored-when-wrapping-flex-items) that prevents this from working without an explicit `flex-basis` or `border`. Our example works thanks to the `border` being set; you can do the same with `.col { border: 1px solid transparent; }`. Alternatively, you can set the flex-basis to the width of the column (e.g., `.col { flex: 1 0 50%; }`).
-
-Both these fixes have been documented in a [reduced test case outside Bootstrap](https://output.jsbin.com/micohor).
-
-<div class="bd-example-row">
-{% example html %}
-<div class="container">
-  <div class="row">
-    <div class="col">Column</div>
-    <div class="col">Column</div>
-    <div class="w-100"></div>
-    <div class="col">Column</div>
-    <div class="col">Column</div>
-  </div>
-</div>
-{% endexample %}
-</div>
-
-### Setting one column width
-
-Auto-layout for flexbox grid columns also means you can set the width of one column and have the sibling columns automatically resize around it. You may use predefined grid classes (as shown below), grid mixins, or inline widths. Note that the other columns will resize no matter the width of the center column.
-
-<div class="bd-example-row">
-{% example html %}
-<div class="container">
-  <div class="row">
-    <div class="col">
-      1 of 3
-    </div>
-    <div class="col-6">
-      2 of 3 (wider)
-    </div>
-    <div class="col">
-      3 of 3
-    </div>
-  </div>
-  <div class="row">
-    <div class="col">
-      1 of 3
-    </div>
-    <div class="col-5">
-      2 of 3 (wider)
-    </div>
-    <div class="col">
-      3 of 3
-    </div>
-  </div>
-</div>
-{% endexample %}
-</div>
-
-### Variable width content
-
-Use `col-{breakpoint}-auto` classes to size columns based on the natural width of their content.
-
-<div class="bd-example-row">
-{% example html %}
-<div class="container">
-  <div class="row justify-content-md-center">
-    <div class="col col-lg-2">
-      1 of 3
-    </div>
-    <div class="col-md-auto">
-      Variable width content
-    </div>
-    <div class="col col-lg-2">
-      3 of 3
-    </div>
-  </div>
-  <div class="row">
-    <div class="col">
-      1 of 3
-    </div>
-    <div class="col-md-auto">
-      Variable width content
-    </div>
-    <div class="col col-lg-2">
-      3 of 3
-    </div>
-  </div>
-</div>
-{% endexample %}
-</div>
-
-### Equal-width multi-row
-
-Create equal-width columns that span multiple rows by inserting a `.w-100` where you want the columns to break to a new line. Make the breaks responsive by mixing the `.w-100` with some [responsive display utilities]({{ site.baseurl }}/utilities/display-property/).
-
-<div class="bd-example-row">
-{% example html %}
-<div class="row">
-  <div class="col">col</div>
-  <div class="col">col</div>
-  <div class="w-100"></div>
-  <div class="col">col</div>
-  <div class="col">col</div>
-</div>
-{% endexample %}
-</div>
-
-## Responsive classes
-
-Bootstrap's grid includes five tiers of predefined classes for building complex responsive layouts. Customize the size of your columns on extra small, small, medium, large, or extra large devices however you see fit.
-
-### All breakpoints
-
-For grids that are the same from the smallest of devices to the largest, use the `.col` and `.col-*` classes. Specify a numbered class when you need a particularly sized column; otherwise, feel free to stick to `.col`.
-
-<div class="bd-example-row">
-{% example html %}
-<div class="row">
-  <div class="col">col</div>
-  <div class="col">col</div>
-  <div class="col">col</div>
-  <div class="col">col</div>
-</div>
-<div class="row">
-  <div class="col-8">col-8</div>
-  <div class="col-4">col-4</div>
-</div>
-{% endexample %}
-</div>
-
-### Stacked to horizontal
-
-Using a single set of `.col-sm-*` classes, you can create a basic grid system that starts out stacked on extra small devices before becoming horizontal on desktop (medium) devices.
-
-<div class="bd-example-row">
-{% example html %}
-<div class="row">
-  <div class="col-sm-8">col-sm-8</div>
-  <div class="col-sm-4">col-sm-4</div>
-</div>
-<div class="row">
-  <div class="col-sm">col-sm</div>
-  <div class="col-sm">col-sm</div>
-  <div class="col-sm">col-sm</div>
-</div>
-{% endexample %}
-</div>
-
-### Mix and match
-
-Don't want your columns to simply stack in some grid tiers? Use a combination of different classes for each tier as needed. See the example below for a better idea of how it all works.
-
-<div class="bd-example-row">
-{% example html %}
-<!-- Stack the columns on mobile by making one full-width and the other half-width -->
-<div class="row">
-  <div class="col-12 col-md-8">.col-12 .col-md-8</div>
-  <div class="col-6 col-md-4">.col-6 .col-md-4</div>
-</div>
-
-<!-- Columns start at 50% wide on mobile and bump up to 33.3% wide on desktop -->
-<div class="row">
-  <div class="col-6 col-md-4">.col-6 .col-md-4</div>
-  <div class="col-6 col-md-4">.col-6 .col-md-4</div>
-  <div class="col-6 col-md-4">.col-6 .col-md-4</div>
-</div>
-
-<!-- Columns are always 50% wide, on mobile and desktop -->
-<div class="row">
-  <div class="col-6">.col-6</div>
-  <div class="col-6">.col-6</div>
-</div>
-{% endexample %}
-</div>
-
-## Alignment
-
-Use flexbox alignment utilities to vertically and horizontally align columns.
-
-### Vertical alignment
-
-<div class="bd-example-row bd-example-row-flex-cols">
-{% example html %}
-<div class="container">
-  <div class="row align-items-start">
-    <div class="col">
-      One of three columns
-    </div>
-    <div class="col">
-      One of three columns
-    </div>
-    <div class="col">
-      One of three columns
-    </div>
-  </div>
-  <div class="row align-items-center">
-    <div class="col">
-      One of three columns
-    </div>
-    <div class="col">
-      One of three columns
-    </div>
-    <div class="col">
-      One of three columns
-    </div>
-  </div>
-  <div class="row align-items-end">
-    <div class="col">
-      One of three columns
-    </div>
-    <div class="col">
-      One of three columns
-    </div>
-    <div class="col">
-      One of three columns
-    </div>
-  </div>
-</div>
-{% endexample %}
-</div>
-
-<div class="bd-example-row bd-example-row-flex-cols">
-{% example html %}
-<div class="container">
-  <div class="row">
-    <div class="col align-self-start">
-      One of three columns
-    </div>
-    <div class="col align-self-center">
-      One of three columns
-    </div>
-    <div class="col align-self-end">
-      One of three columns
-    </div>
-  </div>
-</div>
-{% endexample %}
-</div>
-
-### Horizontal alignment
-
-<div class="bd-example-row">
-{% example html %}
-<div class="container">
-  <div class="row justify-content-start">
-    <div class="col-4">
-      One of two columns
-    </div>
-    <div class="col-4">
-      One of two columns
-    </div>
-  </div>
-  <div class="row justify-content-center">
-    <div class="col-4">
-      One of two columns
-    </div>
-    <div class="col-4">
-      One of two columns
-    </div>
-  </div>
-  <div class="row justify-content-end">
-    <div class="col-4">
-      One of two columns
-    </div>
-    <div class="col-4">
-      One of two columns
-    </div>
-  </div>
-  <div class="row justify-content-around">
-    <div class="col-4">
-      One of two columns
-    </div>
-    <div class="col-4">
-      One of two columns
-    </div>
-  </div>
-  <div class="row justify-content-between">
-    <div class="col-4">
-      One of two columns
-    </div>
-    <div class="col-4">
-      One of two columns
-    </div>
-  </div>
-</div>
-{% endexample %}
-</div>
-
-### No gutters
-
-The gutters between columns in our predefined grid classes can be removed with `.no-gutters`. This removes the negative `margin`s from `.row` and the horizontal `padding` from all immediate children columns.
-
-Here's the source code for creating these styles. Note that column overrides are scoped to only the first children columns and are targeted via [attribute selector](https://developer.mozilla.org/en-US/docs/Web/CSS/Attribute_selectors). While this generates a more specific selector, column padding can still be further customized with [spacing utilities]({{ site.baseurl }}/utilities/spacing/).
-
-{% highlight sass %}
-.no-gutters {
-  margin-right: 0;
-  margin-left: 0;
-
-  > .col,
-  > [class*="col-"] {
-    padding-right: 0;
-    padding-left: 0;
-  }
-}
-{% endhighlight %}
-
-In practice, here's how it looks. Note you can continue to use this with all other predefined grid classes (including column widths, responsive tiers, reorders, and more).
-
-<div class="bd-example-row">
-{% example html %}
-<div class="row no-gutters">
-  <div class="col-12 col-sm-6 col-md-8">.col-12 .col-sm-6 .col-md-8</div>
-  <div class="col-6 col-md-4">.col-6 .col-md-4</div>
-</div>
-{% endexample %}
-</div>
-
-### Column wrapping
-
-If more than 12 columns are placed within a single row, each group of extra columns will, as one unit, wrap onto a new line.
-
-<div class="bd-example-row">
-{% example html %}
-<div class="row">
-  <div class="col-9">.col-9</div>
-  <div class="col-4">.col-4<br>Since 9 + 4 = 13 &gt; 12, this 4-column-wide div gets wrapped onto a new line as one contiguous unit.</div>
-  <div class="col-6">.col-6<br>Subsequent columns continue along the new line.</div>
-</div>
-{% endexample %}
-</div>
-
-### Column resets
-
-With the handful of grid tiers available, you're bound to run into issues where, at certain breakpoints, your columns don't clear quite right as one is taller than the other. To fix that, use a combination of a `.clearfix` and our [responsive display utilities]({{ site.baseurl }}/utilities/display/).
-
-<div class="bd-example-row">
-{% example html %}
-<div class="row">
-  <div class="col-6 col-sm-3">.col-6 .col-sm-3</div>
-  <div class="col-6 col-sm-3">.col-6 .col-sm-3</div>
-
-  <!-- Add the extra clearfix for only the required viewport -->
-  <div class="clearfix d-none d-sm-block"></div>
-
-  <div class="col-6 col-sm-3">.col-6 .col-sm-3</div>
-  <div class="col-6 col-sm-3">.col-6 .col-sm-3</div>
-</div>
-{% endexample %}
-</div>
-
-In addition to column clearing at responsive breakpoints, you may need to **reset offsets, pushes, or pulls**. See this in action in [the grid example]({{ site.baseurl }}/examples/grid/).
-
-<div class="bd-example-row">
-{% example html %}
-<div class="row">
-  <div class="col-sm-5 col-md-6">.col-sm-5 .col-md-6</div>
-  <div class="col-sm-5 offset-sm-2 col-md-6 offset-md-0">.col-sm-5 .offset-sm-2 .col-md-6 .offset-md-0</div>
-</div>
-
-<div class="row">
-  <div class="col-sm-6 col-md-5 col-lg-6">.col.col-sm-6.col-md-5.col-lg-6</div>
-  <div class="col-sm-6 col-md-5 offset-md-2 col-lg-6 offset-lg-0">.col-sm-6 .col-md-5 .offset-md-2 .col-lg-6 .offset-lg-0</div>
-</div>
-{% endexample %}
-</div>
-
-## Reordering
-
-### Flex order
-
-Use flexbox utilities for controlling the **visual order** of your content.
-
-<div class="bd-example-row">
-{% example html %}
-<div class="container">
-  <div class="row">
-    <div class="col order-0">
-      First, but unordered
-    </div>
-    <div class="col order-last">
-      Second, but last
-    </div>
-    <div class="col order-first">
-      Third, but first
-    </div>
-  </div>
-</div>
-{% endexample %}
-</div>
-
-### Offsetting columns
-
-Move columns to the right using `.offset-md-*` classes. These classes increase the left margin of a column by `*` columns. For example, `.offset-md-4` moves `.col-md-4` over four columns.
-
-<div class="bd-example-row">
-{% example html %}
-<div class="row">
-  <div class="col-md-4">.col-md-4</div>
-  <div class="col-md-4 offset-md-4">.col-md-4 .offset-md-4</div>
-</div>
-<div class="row">
-  <div class="col-md-3 offset-md-3">.col-md-3 .offset-md-3</div>
-  <div class="col-md-3 offset-md-3">.col-md-3 .offset-md-3</div>
-</div>
-<div class="row">
-  <div class="col-md-6 offset-md-3">.col-md-6 .offset-md-3</div>
-</div>
-{% endexample %}
-</div>
-
-### Push and pull
-
-Easily change the order of our built-in grid columns with `.push-md-*` and `.pull-md-*` modifier classes.
-
-<div class="bd-example-row">
-{% example html %}
-<div class="row">
-  <div class="col-md-9 push-md-3">.col-md-9 .push-md-3</div>
-  <div class="col-md-3 pull-md-9">.col-md-3 .pull-md-9</div>
-</div>
-{% endexample %}
-</div>
-
-## Nesting
-
-To nest your content with the default grid, add a new `.row` and set of `.col-sm-*` columns within an existing `.col-sm-*` column. Nested rows should include a set of columns that add up to 12 or fewer (it is not required that you use all 12 available columns).
-
-<div class="bd-example-row">
-{% example html %}
-<div class="row">
-  <div class="col-sm-9">
-    Level 1: .col-sm-9
-    <div class="row">
-      <div class="col-8 col-sm-6">
-        Level 2: .col-8 .col-sm-6
-      </div>
-      <div class="col-4 col-sm-6">
-        Level 2: .col-4 .col-sm-6
-      </div>
-    </div>
-  </div>
-</div>
-{% endexample %}
-</div>
-
-## Sass mixins
-
-When using Bootstrap's source Sass files, you have the option of using Sass variables and mixins to create custom, semantic, and responsive page layouts. Our predefined grid classes use these same variables and mixins to provide a whole suite of ready-to-use classes for fast responsive layouts.
-
-### Variables
-
-Variables and maps determine the number of columns, the gutter width, and the media query point at which to begin floating columns. We use these to generate the predefined grid classes documented above, as well as for the custom mixins listed below.
-
-{% highlight scss %}
-$grid-columns:      12;
-$grid-gutter-width-base: 30px;
-
-$grid-gutter-widths: (
-  xs: $grid-gutter-width-base, // 30px
-  sm: $grid-gutter-width-base, // 30px
-  md: $grid-gutter-width-base, // 30px
-  lg: $grid-gutter-width-base, // 30px
-  xl: $grid-gutter-width-base  // 30px
-)
-
-$grid-breakpoints: (
-  // Extra small screen / phone
-  xs: 0,
-  // Small screen / phone
-  sm: 576px,
-  // Medium screen / tablet
-  md: 768px,
-  // Large screen / desktop
-  lg: 992px,
-  // Extra large screen / wide desktop
-  xl: 1200px
-);
-
-$container-max-widths: (
-  sm: 540px,
-  md: 720px,
-  lg: 960px,
-  xl: 1140px
-);
-{% endhighlight %}
-
-### Mixins
-
-Mixins are used in conjunction with the grid variables to generate semantic CSS for individual grid columns.
-
-{% highlight scss %}
-// Creates a wrapper for a series of columns
-@include make-row($gutters: $grid-gutter-widths);
-
-// Make the element grid-ready (applying everything but the width)
-@include make-col-ready($gutters: $grid-gutter-widths);
-@include make-col($size, $columns: $grid-columns);
-
-// Get fancy by offsetting, or changing the sort order
-@include make-col-offset($size, $columns: $grid-columns);
-@include make-col-push($size, $columns: $grid-columns);
-@include make-col-pull($size, $columns: $grid-columns);
-{% endhighlight %}
-
-### Example usage
-
-You can modify the variables to your own custom values, or just use the mixins with their default values. Here's an example of using the default settings to create a two-column layout with a gap between.
-
-{% highlight scss %}
-.example-container {
-  width: 800px;
-  @include make-container();
-}
-
-.example-row {
-  @include make-row();
-}
-
-.example-content-main {
-  @include make-col-ready();
-
-  @include media-breakpoint-up(sm) {
-    @include make-col(6);
-  }
-  @include media-breakpoint-up(lg) {
-    @include make-col(8);
-  }
-}
-
-.example-content-secondary {
-  @include make-col-ready();
-
-  @include media-breakpoint-up(sm) {
-    @include make-col(6);
-  }
-  @include media-breakpoint-up(lg) {
-    @include make-col(4);
-  }
-}
-{% endhighlight %}
-
-{% example html %}
-<div class="example-container">
-  <div class="example-row">
-    <div class="example-content-main">Main content</div>
-    <div class="example-content-secondary">Secondary content</div>
-  </div>
-</div>
-{% endexample %}
-
-## Customizing the grid
-
-Using our built-in grid Sass variables and maps, it's possible to completely customize the predefined grid classes. Change the number of tiers, the media query dimensions, and the container widths—then recompile.
-
-### Columns and gutters
-
-The number of grid columns and their horizontal padding (aka, gutters) can be modified via Sass variables. `$grid-columns` is used to generate the widths (in percent) of each individual column while `$grid-gutter-widths` allows breakpoint-specific widths that are divided evenly across `padding-left` and `padding-right` for the column gutters.
-
-{% highlight scss %}
-$grid-columns:               12 !default;
-$grid-gutter-width-base:     30px !default;
-$grid-gutter-widths: (
-  xs: $grid-gutter-width-base,
-  sm: $grid-gutter-width-base,
-  md: $grid-gutter-width-base,
-  lg: $grid-gutter-width-base,
-  xl: $grid-gutter-width-base
-) !default;
-{% endhighlight %}
-
-### Grid tiers
-
-Moving beyond the columns themselves, you may also customize the number of grid tiers. If you wanted just four grid tiers, you'd update the `$grid-breakpoints` and `$container-max-widths` to something like this:
-
-{% highlight scss %}
-$grid-breakpoints: (
-  xs: 0,
-  sm: 480px,
-  md: 768px,
-  lg: 1024px
-);
-
-$container-max-widths: (
-  sm: 420px,
-  md: 720px,
-  lg: 960px
-);
-{% endhighlight %}
-
-When making any changes to the Sass variables or maps, you'll need to save your changes and recompile. Doing so will out a brand new set of predefined grid classes for column widths, offsets, pushes, and pulls. Responsive visibility utilities will also be updated to use the custom breakpoints.
diff --git a/docs/layout/media-object.md b/docs/layout/media-object.md
deleted file mode 100644
index 5023e4580..000000000
--- a/docs/layout/media-object.md
+++ /dev/null
@@ -1,136 +0,0 @@
----
-layout: docs
-title: Media object
-description: Documentation and examples for Bootstrap's media object to construct highly repetitive components like blog comments, tweets, and the like.
-group: layout
-toc: true
----
-
-## Example
-
-The [media object](http://www.stubbornella.org/content/2010/06/25/the-media-object-saves-hundreds-of-lines-of-code/) helps build complex and repetitive components where some media is positioned alongside content that doesn't wrap around said media. Plus, it does this with only two required classes thanks to flexbox.
-
-Below is an example of a single media object. Only two classes are required—the wrapping `.media` and the `.media-body` around your content. Optional padding and margin can be controlled through [spacing utilities]({{ site.baseurl }}/utilities/spacing/).
-
-{% example html %}
-<div class="media">
-  <img class="d-flex mr-3" data-src="holder.js/64x64" alt="Generic placeholder image">
-  <div class="media-body">
-    <h5 class="mt-0">Media heading</h5>
-    Cras sit amet nibh libero, in gravida nulla. Nulla vel metus scelerisque ante sollicitudin. Cras purus odio, vestibulum in vulputate at, tempus viverra turpis. Fusce condimentum nunc ac nisi vulputate fringilla. Donec lacinia congue felis in faucibus.
-  </div>
-</div>
-{% endexample %}
-
-{% callout warning %}
-##### Flexbug #12: Inline elements aren't treated as flex items
-
-Internet Explorer 10-11 do not render inline elements like links or images (or `::before` and `::after` pseudo-elements) as flex items. The only workaround is to set a non-inline `display` value (e.g., `block`, `inline-block`, or `flex`). We suggest using `.d-flex`, one of our [display utilities]({{ site.baseurl }}/utilities/display-property/), as an easy fix.
-
-**Source:** [Flexbugs on GitHub](https://github.com/philipwalton/flexbugs#12-inline-elements-are-not-treated-as-flex-items)
-{% endcallout %}
-
-## Nesting
-
-Media objects can be infinitely nested, though we suggest you stop at some point. Place nested `.media` within the `.media-body` of a parent media object.
-
-{% example html %}
-<div class="media">
-  <img class="d-flex mr-3" data-src="holder.js/64x64" alt="Generic placeholder image">
-  <div class="media-body">
-    <h5 class="mt-0">Media heading</h5>
-    Cras sit amet nibh libero, in gravida nulla. Nulla vel metus scelerisque ante sollicitudin. Cras purus odio, vestibulum in vulputate at, tempus viverra turpis. Fusce condimentum nunc ac nisi vulputate fringilla. Donec lacinia congue felis in faucibus.
-
-    <div class="media mt-3">
-      <a class="d-flex pr-3" href="#">
-        <img data-src="holder.js/64x64" alt="Generic placeholder image">
-      </a>
-      <div class="media-body">
-        <h5 class="mt-0">Media heading</h5>
-        Cras sit amet nibh libero, in gravida nulla. Nulla vel metus scelerisque ante sollicitudin. Cras purus odio, vestibulum in vulputate at, tempus viverra turpis. Fusce condimentum nunc ac nisi vulputate fringilla. Donec lacinia congue felis in faucibus.
-      </div>
-    </div>
-  </div>
-</div>
-{% endexample %}
-
-## Alignment
-
-Media in a media object can be aligned with flexbox utilities to the top (default), middle, or end of your `.media-body` content.
-
-{% example html %}
-<div class="media">
-  <img class="d-flex align-self-start mr-3" data-src="holder.js/64x64" alt="Generic placeholder image">
-  <div class="media-body">
-    <h5 class="mt-0">Top-aligned media</h5>
-    <p>Cras sit amet nibh libero, in gravida nulla. Nulla vel metus scelerisque ante sollicitudin. Cras purus odio, vestibulum in vulputate at, tempus viverra turpis. Fusce condimentum nunc ac nisi vulputate fringilla. Donec lacinia congue felis in faucibus.</p>
-    <p>Donec sed odio dui. Nullam quis risus eget urna mollis ornare vel eu leo. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.</p>
-  </div>
-</div>
-{% endexample %}
-
-{% example html %}
-<div class="media">
-  <img class="d-flex align-self-center mr-3" data-src="holder.js/64x64" alt="Generic placeholder image">
-  <div class="media-body">
-    <h5 class="mt-0">Center-aligned media</h5>
-    <p>Cras sit amet nibh libero, in gravida nulla. Nulla vel metus scelerisque ante sollicitudin. Cras purus odio, vestibulum in vulputate at, tempus viverra turpis. Fusce condimentum nunc ac nisi vulputate fringilla. Donec lacinia congue felis in faucibus.</p>
-    <p class="mb-0">Donec sed odio dui. Nullam quis risus eget urna mollis ornare vel eu leo. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.</p>
-  </div>
-</div>
-{% endexample %}
-
-{% example html %}
-<div class="media">
-  <img class="d-flex align-self-end mr-3" data-src="holder.js/64x64" alt="Generic placeholder image">
-  <div class="media-body">
-    <h5 class="mt-0">Bottom-aligned media</h5>
-    <p>Cras sit amet nibh libero, in gravida nulla. Nulla vel metus scelerisque ante sollicitudin. Cras purus odio, vestibulum in vulputate at, tempus viverra turpis. Fusce condimentum nunc ac nisi vulputate fringilla. Donec lacinia congue felis in faucibus.</p>
-    <p class="mb-0">Donec sed odio dui. Nullam quis risus eget urna mollis ornare vel eu leo. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.</p>
-  </div>
-</div>
-{% endexample %}
-
-## Order
-
-Change the order of content in media objects by modifying the HTML itself, or by adding some custom flexbox CSS to set the `order` property (to an integer of your choosing).
-
-{% example html %}
-<div class="media">
-  <div class="media-body">
-    <h5 class="mt-0 mb-1">Media object</h5>
-    Cras sit amet nibh libero, in gravida nulla. Nulla vel metus scelerisque ante sollicitudin. Cras purus odio, vestibulum in vulputate at, tempus viverra turpis. Fusce condimentum nunc ac nisi vulputate fringilla. Donec lacinia congue felis in faucibus.
-  </div>
-  <img class="d-flex ml-3" data-src="holder.js/64x64" alt="Generic placeholder image">
-</div>
-{% endexample %}
-
-## Media list
-
-Because the media object has so few structural requirements, you can also use these classes on list HTML elements. On your `<ul>` or `<ol>`, add the `.list-unstyled` to remove any browser default list styles, and then apply `.media` to your `<li>`s. As always, use spacing utilities wherever needed to fine tune.
-
-{% example html %}
-<ul class="list-unstyled">
-  <li class="media">
-    <img class="d-flex mr-3" data-src="holder.js/64x64" alt="Generic placeholder image">
-    <div class="media-body">
-      <h5 class="mt-0 mb-1">List-based media object</h5>
-      Cras sit amet nibh libero, in gravida nulla. Nulla vel metus scelerisque ante sollicitudin. Cras purus odio, vestibulum in vulputate at, tempus viverra turpis. Fusce condimentum nunc ac nisi vulputate fringilla. Donec lacinia congue felis in faucibus.
-    </div>
-  </li>
-  <li class="media my-4">
-    <img class="d-flex mr-3" data-src="holder.js/64x64" alt="Generic placeholder image">
-    <div class="media-body">
-      <h5 class="mt-0 mb-1">List-based media object</h5>
-      Cras sit amet nibh libero, in gravida nulla. Nulla vel metus scelerisque ante sollicitudin. Cras purus odio, vestibulum in vulputate at, tempus viverra turpis. Fusce condimentum nunc ac nisi vulputate fringilla. Donec lacinia congue felis in faucibus.
-    </div>
-  </li>
-  <li class="media">
-    <img class="d-flex mr-3" data-src="holder.js/64x64" alt="Generic placeholder image">
-    <div class="media-body">
-      <h5 class="mt-0 mb-1">List-based media object</h5>
-      Cras sit amet nibh libero, in gravida nulla. Nulla vel metus scelerisque ante sollicitudin. Cras purus odio, vestibulum in vulputate at, tempus viverra turpis. Fusce condimentum nunc ac nisi vulputate fringilla. Donec lacinia congue felis in faucibus.
-    </div>
-  </li>
-</ul>
-{% endexample %}
diff --git a/docs/layout/overview.md b/docs/layout/overview.md
deleted file mode 100644
index b167bbc2e..000000000
--- a/docs/layout/overview.md
+++ /dev/null
@@ -1,175 +0,0 @@
----
-layout: docs
-title: Overview
-description: Components and options for laying out your Bootstrap project, including wrapping containers, a powerful grid system, a flexible media object, and responsive utility classes.
-group: layout
-redirect_from: "/layout/"
-toc: true
----
-
-## Containers
-
-Containers are the most basic layout element in Bootstrap and are **required when using our default grid system**. Choose from a responsive, fixed-width container (meaning its `max-width` changes at each breakpoint) or fluid-width (meaning it's `100%` wide all the time).
-
-While containers *can* be nested, most layouts do not require a nested container.
-
-<div class="bd-example">
-  <div class="bd-example-container">
-    <div class="bd-example-container-header"></div>
-    <div class="bd-example-container-sidebar"></div>
-    <div class="bd-example-container-body"></div>
-  </div>
-</div>
-
-{% highlight html %}
-<div class="container">
-  <!-- Content here -->
-</div>
-{% endhighlight %}
-
-Use `.container-fluid` for a full width container, spanning the entire width of the viewport.
-
-<div class="bd-example">
-  <div class="bd-example-container bd-example-container-fluid">
-    <div class="bd-example-container-header"></div>
-    <div class="bd-example-container-sidebar"></div>
-    <div class="bd-example-container-body"></div>
-  </div>
-</div>
-
-{% highlight html %}
-<div class="container-fluid">
-  ...
-</div>
-{% endhighlight %}
-
-
-## Responsive breakpoints
-
-Since Bootstrap is developed to be mobile first, we use a handful of [media queries](https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries) to create sensible breakpoints for our layouts and interfaces. These breakpoints are mostly based on minimum viewport widths and allow us to scale up elements as the viewport changes.
-
-Bootstrap primarily uses the following media query ranges—or breakpoints—in our source Sass files for our layout, grid system, and components.
-
-{% highlight scss %}
-// Extra small devices (portrait phones, less than 576px)
-// No media query since this is the default in Bootstrap
-
-// Small devices (landscape phones, 576px and up)
-@media (min-width: 576px) { ... }
-
-// Medium devices (tablets, 768px and up)
-@media (min-width: 768px) { ... }
-
-// Large devices (desktops, 992px and up)
-@media (min-width: 992px) { ... }
-
-// Extra large devices (large desktops, 1200px and up)
-@media (min-width: 1200px) { ... }
-{% endhighlight %}
-
-Since we write our source CSS in Sass, all our media queries are available via Sass mixins:
-
-{% highlight scss %}
-@include media-breakpoint-up(xs) { ... }
-@include media-breakpoint-up(sm) { ... }
-@include media-breakpoint-up(md) { ... }
-@include media-breakpoint-up(lg) { ... }
-@include media-breakpoint-up(xl) { ... }
-
-// Example usage:
-@include media-breakpoint-up(sm) {
-  .some-class {
-    display: block;
-  }
-}
-{% endhighlight %}
-
-We occasionally use media queries that go in the other direction (the given screen size *or smaller*):
-
-{% highlight scss %}
-// Extra small devices (portrait phones, less than 576px)
-@media (max-width: 575px) { ... }
-
-// Small devices (landscape phones, less than 768px)
-@media (max-width: 767px) { ... }
-
-// Medium devices (tablets, less than 992px)
-@media (max-width: 991px) { ... }
-
-// Large devices (desktops, less than 1200px)
-@media (max-width: 1199px) { ... }
-
-// Extra large devices (large desktops)
-// No media query since the extra-large breakpoint has no upper bound on its width
-{% endhighlight %}
-
-Once again, these media queries are also available via Sass mixins:
-
-{% highlight scss %}
-@include media-breakpoint-down(xs) { ... }
-@include media-breakpoint-down(sm) { ... }
-@include media-breakpoint-down(md) { ... }
-@include media-breakpoint-down(lg) { ... }
-{% endhighlight %}
-
-There are also media queries and mixins for targeting a single segment of screen sizes using the minimum and maximum breakpoint widths.
-
-{% highlight scss %}
-// Extra small devices (portrait phones, less than 576px)
-@media (max-width: 575px) { ... }
-
-// Small devices (landscape phones, 576px and up)
-@media (min-width: 576px) and (max-width: 767px) { ... }
-
-// Medium devices (tablets, 768px and up)
-@media (min-width: 768px) and (max-width: 991px) { ... }
-
-// Large devices (desktops, 992px and up)
-@media (min-width: 992px) and (max-width: 1199px) { ... }
-
-// Extra large devices (large desktops, 1200px and up)
-@media (min-width: 1200px) { ... }
-{% endhighlight %}
-
-These media queries are also available via Sass mixins:
-
-{% highlight scss %}
-@include media-breakpoint-only(xs) { ... }
-@include media-breakpoint-only(sm) { ... }
-@include media-breakpoint-only(md) { ... }
-@include media-breakpoint-only(lg) { ... }
-@include media-breakpoint-only(xl) { ... }
-{% endhighlight %}
-
-Similarly, media queries may span multiple breakpoint widths:
-
-{% highlight scss %}
-// Example
-// Apply styles starting from medium devices and up to extra large devices
-@media (min-width: 768px) and (max-width: 1199px) { ... }
-{% endhighlight %}
-
-The Sass mixin for targeting the same screen size range would be:
-
-{% highlight scss %}
-@include media-breakpoint-between(md, xl) { ... }
-{% endhighlight %}
-
-## Z-index
-
-Several Bootstrap components utilize `z-index`, the CSS property that helps control layout by providing a third axis to arrange content. We utilize a default z-index scale in Bootstrap that's been designed to properly layer navigation, tooltips and popovers, modals, and more.
-
-We don't encourage customization of these values; should you change one, you likely need to change them all.
-
-```scss
-$zindex-dropdown-backdrop:  990 !default;
-$zindex-dropdown:          1000 !default;
-$zindex-fixed:             1030 !default;
-$zindex-sticky:            1030 !default;
-$zindex-modal-backdrop:    1040 !default;
-$zindex-modal:             1050 !default;
-$zindex-popover:           1060 !default;
-$zindex-tooltip:           1070 !default;
-```
-
-Background elements—like the backdrops that allow click-dismissing—tend to reside on a lower `z-index`s, while navigation and popovers utilize higher `z-index`s to ensure they overlay surrounding content.
diff --git a/docs/layout/utilities-for-layout.md b/docs/layout/utilities-for-layout.md
deleted file mode 100644
index 451d43cd1..000000000
--- a/docs/layout/utilities-for-layout.md
+++ /dev/null
@@ -1,25 +0,0 @@
----
-layout: docs
-title: Utilities for layout
-description: For faster mobile-friendly and responsive development, Bootstrap includes dozens of utility classes for showing, hiding, aligning, and spacing content.
-group: layout
-toc: true
----
-
-## Changing `display`
-
-Use our `display` utilities for responsively toggling common values of the `display` property. Mix it with our grid system, content, or components to show or hide them across specific viewports.
-
-## Flexbox options
-
-Bootstrap 4 is built with flexbox, but not every element's `display` has been changed to `display: flex` as this would add many unnecessary overrides and unexpectedly change key browser behaviors. Most of [our components](/components/) are built with flexbox enabled.
-
-Should you need to add `display: flex` to an element, do so with `.d-flex` or one of the responsive variants (e.g., `.d-sm-flex`). You'll need this class or `display` value to allow the use of our extra [flexbox utilities](/utilities/flexbox/) for sizing, alignment, spacing, and more.
-
-## Margin and padding
-
-Use the `margin` and `padding` [spacing utilities](/utilities/spacing/) to control how elements and components are spaced and sized. Bootstrap 4 includes a five-level scale for spacing utilities, based on a `1rem` value default `$spacer` variable. Choose values for all viewports (e.g., `.mr-3` for `margin-right: 1rem`), or pick responsive variants to target specific viewports (e.g., `.mr-md-3` for `margin-right: 1rem` starting at the `md` breakpoint).
-
-## Toggle `visibility`
-
-When toggling `display` isn't needed, you can toggle the `visibility` of an element with our [visibility utilities](/utilities/visibility/). Invisible elements will still affect the layout of the page, but are visually hidden from visitors.