Update snippet examples for dark mode (#37834)

* Update snippet examples for dark mode

* Fix markup

* Review comments

* undo colored links docs from this PR

2 files changed, 139 insertions, 129 deletions

diff --git a/site/content/docs/5.3/examples/list-groups/index.html b/site/content/docs/5.3/examples/list-groups/index.html
index 7163b1835..9e24053a5 100644
--- a/site/content/docs/5.3/examples/list-groups/index.html
+++ b/site/content/docs/5.3/examples/list-groups/index.html
@@ -27,43 +27,45 @@ body_class: ""
   </symbol>
 </svg>
 
-<div class="list-group w-auto">
-  <a href="#" class="list-group-item list-group-item-action d-flex gap-3 py-3" aria-current="true">
-    <img src="https://github.com/twbs.png" alt="twbs" width="32" height="32" class="rounded-circle flex-shrink-0">
-    <div class="d-flex gap-2 w-100 justify-content-between">
-      <div>
-        <h6 class="mb-0">List group item heading</h6>
-        <p class="mb-0 opacity-75">Some placeholder content in a paragraph.</p>
+<div class="d-flex flex-column flex-md-row p-4 gap-4 py-md-5 align-items-center justify-content-center">
+  <div class="list-group">
+    <a href="#" class="list-group-item list-group-item-action d-flex gap-3 py-3" aria-current="true">
+      <img src="https://github.com/twbs.png" alt="twbs" width="32" height="32" class="rounded-circle flex-shrink-0">
+      <div class="d-flex gap-2 w-100 justify-content-between">
+        <div>
+          <h6 class="mb-0">List group item heading</h6>
+          <p class="mb-0 opacity-75">Some placeholder content in a paragraph.</p>
+        </div>
+        <small class="opacity-50 text-nowrap">now</small>
       </div>
-      <small class="opacity-50 text-nowrap">now</small>
-    </div>
-  </a>
-  <a href="#" class="list-group-item list-group-item-action d-flex gap-3 py-3" aria-current="true">
-    <img src="https://github.com/twbs.png" alt="twbs" width="32" height="32" class="rounded-circle flex-shrink-0">
-    <div class="d-flex gap-2 w-100 justify-content-between">
-      <div>
-        <h6 class="mb-0">Another title here</h6>
-        <p class="mb-0 opacity-75">Some placeholder content in a paragraph that goes a little longer so it wraps to a new line.</p>
+    </a>
+    <a href="#" class="list-group-item list-group-item-action d-flex gap-3 py-3" aria-current="true">
+      <img src="https://github.com/twbs.png" alt="twbs" width="32" height="32" class="rounded-circle flex-shrink-0">
+      <div class="d-flex gap-2 w-100 justify-content-between">
+        <div>
+          <h6 class="mb-0">Another title here</h6>
+          <p class="mb-0 opacity-75">Some placeholder content in a paragraph that goes a little longer so it wraps to a new line.</p>
+        </div>
+        <small class="opacity-50 text-nowrap">3d</small>
       </div>
-      <small class="opacity-50 text-nowrap">3d</small>
-    </div>
-  </a>
-  <a href="#" class="list-group-item list-group-item-action d-flex gap-3 py-3" aria-current="true">
-    <img src="https://github.com/twbs.png" alt="twbs" width="32" height="32" class="rounded-circle flex-shrink-0">
-    <div class="d-flex gap-2 w-100 justify-content-between">
-      <div>
-        <h6 class="mb-0">Third heading</h6>
-        <p class="mb-0 opacity-75">Some placeholder content in a paragraph.</p>
+    </a>
+    <a href="#" class="list-group-item list-group-item-action d-flex gap-3 py-3" aria-current="true">
+      <img src="https://github.com/twbs.png" alt="twbs" width="32" height="32" class="rounded-circle flex-shrink-0">
+      <div class="d-flex gap-2 w-100 justify-content-between">
+        <div>
+          <h6 class="mb-0">Third heading</h6>
+          <p class="mb-0 opacity-75">Some placeholder content in a paragraph.</p>
+        </div>
+        <small class="opacity-50 text-nowrap">1w</small>
       </div>
-      <small class="opacity-50 text-nowrap">1w</small>
-    </div>
-  </a>
+    </a>
+  </div>
 </div>
 
 <div class="b-example-divider"></div>
 
-<div class="d-flex gap-5 justify-content-center">
-  <div class="list-group mx-0 w-auto">
+<div class="d-flex flex-column flex-md-row p-4 gap-4 py-md-5 align-items-center justify-content-center">
+  <div class="list-group">
     <label class="list-group-item d-flex gap-2">
       <input class="form-check-input flex-shrink-0" type="checkbox" value="" checked>
       <span>
@@ -87,7 +89,7 @@ body_class: ""
     </label>
   </div>
 
-  <div class="list-group mx-0 w-auto">
+  <div class="list-group">
     <label class="list-group-item d-flex gap-2">
       <input class="form-check-input flex-shrink-0" type="radio" name="listGroupRadios" id="listGroupRadios1" value="" checked>
       <span>
@@ -114,109 +116,115 @@ body_class: ""
 
 <div class="b-example-divider"></div>
 
-<div class="list-group w-auto">
-  <label class="list-group-item d-flex gap-3">
-    <input class="form-check-input flex-shrink-0" type="checkbox" value="" checked style="font-size: 1.375em;">
-    <span class="pt-1 form-checked-content">
-      <strong>Finish sales report</strong>
-      <small class="d-block text-muted">
-        <svg class="bi me-1" width="1em" height="1em"><use xlink:href="#calendar-event"/></svg>
-        1:00–2:00pm
-      </small>
-    </span>
-  </label>
-  <label class="list-group-item d-flex gap-3">
-    <input class="form-check-input flex-shrink-0" type="checkbox" value="" style="font-size: 1.375em;">
-    <span class="pt-1 form-checked-content">
-      <strong>Weekly All Hands</strong>
-      <small class="d-block text-muted">
-        <svg class="bi me-1" width="1em" height="1em"><use xlink:href="#calendar-event"/></svg>
-        2:00–2:30pm
-      </small>
-    </span>
-  </label>
-  <label class="list-group-item d-flex gap-3">
-    <input class="form-check-input flex-shrink-0" type="checkbox" value="" style="font-size: 1.375em;">
-    <span class="pt-1 form-checked-content">
-      <strong>Out of office</strong>
-      <small class="d-block text-muted">
-        <svg class="bi me-1" width="1em" height="1em"><use xlink:href="#alarm"/></svg>
-        Tomorrow
-      </small>
-    </span>
-  </label>
-  <label class="list-group-item d-flex gap-3 bg-body-tertiary">
-    <input class="form-check-input form-check-input-placeholder bg-body-tertiary flex-shrink-0 pe-none" disabled type="checkbox" value="" style="font-size: 1.375em;">
-    <span class="pt-1 form-checked-content">
-      <span contenteditable="true" class="w-100">Add new task...</span>
-      <small class="d-block text-muted">
-        <svg class="bi me-1" width="1em" height="1em"><use xlink:href="#list-check"/></svg>
-        Choose list...
-      </small>
-    </span>
-  </label>
+<div class="d-flex flex-column flex-md-row p-4 gap-4 py-md-5 align-items-center justify-content-center">
+  <div class="list-group">
+    <label class="list-group-item d-flex gap-3">
+      <input class="form-check-input flex-shrink-0" type="checkbox" value="" checked style="font-size: 1.375em;">
+      <span class="pt-1 form-checked-content">
+        <strong>Finish sales report</strong>
+        <small class="d-block text-muted">
+          <svg class="bi me-1" width="1em" height="1em"><use xlink:href="#calendar-event"/></svg>
+          1:00–2:00pm
+        </small>
+      </span>
+    </label>
+    <label class="list-group-item d-flex gap-3">
+      <input class="form-check-input flex-shrink-0" type="checkbox" value="" style="font-size: 1.375em;">
+      <span class="pt-1 form-checked-content">
+        <strong>Weekly All Hands</strong>
+        <small class="d-block text-muted">
+          <svg class="bi me-1" width="1em" height="1em"><use xlink:href="#calendar-event"/></svg>
+          2:00–2:30pm
+        </small>
+      </span>
+    </label>
+    <label class="list-group-item d-flex gap-3">
+      <input class="form-check-input flex-shrink-0" type="checkbox" value="" style="font-size: 1.375em;">
+      <span class="pt-1 form-checked-content">
+        <strong>Out of office</strong>
+        <small class="d-block text-muted">
+          <svg class="bi me-1" width="1em" height="1em"><use xlink:href="#alarm"/></svg>
+          Tomorrow
+        </small>
+      </span>
+    </label>
+    <label class="list-group-item d-flex gap-3 bg-body-tertiary">
+      <input class="form-check-input form-check-input-placeholder bg-body-tertiary flex-shrink-0 pe-none" disabled type="checkbox" value="" style="font-size: 1.375em;">
+      <span class="pt-1 form-checked-content">
+        <span contenteditable="true" class="w-100">Add new task...</span>
+        <small class="d-block text-muted">
+          <svg class="bi me-1" width="1em" height="1em"><use xlink:href="#list-check"/></svg>
+          Choose list...
+        </small>
+      </span>
+    </label>
+  </div>
 </div>
 
 <div class="b-example-divider"></div>
 
-<div class="list-group list-group-checkable d-grid gap-2 border-0 w-auto">
-  <input class="list-group-item-check pe-none" type="radio" name="listGroupCheckableRadios" id="listGroupCheckableRadios1" value="" checked>
-  <label class="list-group-item rounded-3 py-3" for="listGroupCheckableRadios1">
-    First radio
-    <span class="d-block small opacity-50">With support text underneath to add more detail</span>
-  </label>
-
-  <input class="list-group-item-check pe-none" type="radio" name="listGroupCheckableRadios" id="listGroupCheckableRadios2" value="">
-  <label class="list-group-item rounded-3 py-3" for="listGroupCheckableRadios2">
-    Second radio
-    <span class="d-block small opacity-50">Some other text goes here</span>
-  </label>
-
-  <input class="list-group-item-check pe-none" type="radio" name="listGroupCheckableRadios" id="listGroupCheckableRadios3" value="">
-  <label class="list-group-item rounded-3 py-3" for="listGroupCheckableRadios3">
-    Third radio
-    <span class="d-block small opacity-50">And we end with another snippet of text</span>
-  </label>
-
-  <input class="list-group-item-check pe-none" type="radio" name="listGroupCheckableRadios" id="listGroupCheckableRadios4" value="" disabled>
-  <label class="list-group-item rounded-3 py-3" for="listGroupCheckableRadios4">
-    Fourth disabled radio
-    <span class="d-block small opacity-50">This option is disabled</span>
-  </label>
-</div>
-
-<div class="b-example-divider"></div>
+<div class="d-flex flex-column flex-md-row p-4 gap-4 py-md-5 align-items-center justify-content-center">
+  <div class="list-group list-group-checkable d-grid gap-2 border-0">
+    <input class="list-group-item-check pe-none" type="radio" name="listGroupCheckableRadios" id="listGroupCheckableRadios1" value="" checked>
+    <label class="list-group-item rounded-3 py-3" for="listGroupCheckableRadios1">
+      First radio
+      <span class="d-block small opacity-50">With support text underneath to add more detail</span>
+    </label>
 
-<div class="list-group list-group-radio d-grid gap-2 border-0 w-auto">
-  <div class="position-relative">
-    <input class="form-check-input position-absolute top-50 end-0 me-3 fs-5" type="radio" name="listGroupRadioGrid" id="listGroupRadioGrid1" value="" checked>
-    <label class="list-group-item py-3 pe-5" for="listGroupRadioGrid1">
-      <strong class="fw-semibold">First radio</strong>
-      <span class="d-block small opacity-75">With support text underneath to add more detail</span>
+    <input class="list-group-item-check pe-none" type="radio" name="listGroupCheckableRadios" id="listGroupCheckableRadios2" value="">
+    <label class="list-group-item rounded-3 py-3" for="listGroupCheckableRadios2">
+      Second radio
+      <span class="d-block small opacity-50">Some other text goes here</span>
     </label>
-  </div>
 
-  <div class="position-relative">
-    <input class="form-check-input position-absolute top-50 end-0 me-3 fs-5" type="radio" name="listGroupRadioGrid" id="listGroupRadioGrid2" value="">
-    <label class="list-group-item py-3 pe-5" for="listGroupRadioGrid2">
-      <strong class="fw-semibold">Second radio</strong>
-      <span class="d-block small opacity-75">Some other text goes here</span>
+    <input class="list-group-item-check pe-none" type="radio" name="listGroupCheckableRadios" id="listGroupCheckableRadios3" value="">
+    <label class="list-group-item rounded-3 py-3" for="listGroupCheckableRadios3">
+      Third radio
+      <span class="d-block small opacity-50">And we end with another snippet of text</span>
     </label>
-  </div>
 
-  <div class="position-relative">
-    <input class="form-check-input position-absolute top-50 end-0 me-3 fs-5" type="radio" name="listGroupRadioGrid" id="listGroupRadioGrid3" value="">
-    <label class="list-group-item py-3 pe-5" for="listGroupRadioGrid3">
-      <strong class="fw-semibold">Third radio</strong>
-      <span class="d-block small opacity-75">And we end with another snippet of text</span>
+    <input class="list-group-item-check pe-none" type="radio" name="listGroupCheckableRadios" id="listGroupCheckableRadios4" value="" disabled>
+    <label class="list-group-item rounded-3 py-3" for="listGroupCheckableRadios4">
+      Fourth disabled radio
+      <span class="d-block small opacity-50">This option is disabled</span>
     </label>
   </div>
+</div>
 
-  <div class="position-relative">
-    <input class="form-check-input position-absolute top-50 end-0 me-3 fs-5" type="radio" name="listGroupRadioGrid" id="listGroupRadioGrid4" value="" disabled>
-    <label class="list-group-item py-3 pe-5" for="listGroupRadioGrid4">
-      <strong class="fw-semibold">Fourth disabled radio</strong>
-      <span class="d-block small opacity-75">This option is disabled</span>
-    </label>
+<div class="b-example-divider"></div>
+
+<div class="d-flex flex-column flex-md-row p-4 gap-4 py-md-5 align-items-center justify-content-center">
+  <div class="list-group list-group-radio d-grid gap-2 border-0">
+    <div class="position-relative">
+      <input class="form-check-input position-absolute top-50 end-0 me-3 fs-5" type="radio" name="listGroupRadioGrid" id="listGroupRadioGrid1" value="" checked>
+      <label class="list-group-item py-3 pe-5" for="listGroupRadioGrid1">
+        <strong class="fw-semibold">First radio</strong>
+        <span class="d-block small opacity-75">With support text underneath to add more detail</span>
+      </label>
+    </div>
+
+    <div class="position-relative">
+      <input class="form-check-input position-absolute top-50 end-0 me-3 fs-5" type="radio" name="listGroupRadioGrid" id="listGroupRadioGrid2" value="">
+      <label class="list-group-item py-3 pe-5" for="listGroupRadioGrid2">
+        <strong class="fw-semibold">Second radio</strong>
+        <span class="d-block small opacity-75">Some other text goes here</span>
+      </label>
+    </div>
+
+    <div class="position-relative">
+      <input class="form-check-input position-absolute top-50 end-0 me-3 fs-5" type="radio" name="listGroupRadioGrid" id="listGroupRadioGrid3" value="">
+      <label class="list-group-item py-3 pe-5" for="listGroupRadioGrid3">
+        <strong class="fw-semibold">Third radio</strong>
+        <span class="d-block small opacity-75">And we end with another snippet of text</span>
+      </label>
+    </div>
+
+    <div class="position-relative">
+      <input class="form-check-input position-absolute top-50 end-0 me-3 fs-5" type="radio" name="listGroupRadioGrid" id="listGroupRadioGrid4" value="" disabled>
+      <label class="list-group-item py-3 pe-5" for="listGroupRadioGrid4">
+        <strong class="fw-semibold">Fourth disabled radio</strong>
+        <span class="d-block small opacity-75">This option is disabled</span>
+      </label>
+    </div>
   </div>
 </div>
diff --git a/site/content/docs/5.3/examples/list-groups/list-groups.css b/site/content/docs/5.3/examples/list-groups/list-groups.css
index 218508412..b90cfa065 100644
--- a/site/content/docs/5.3/examples/list-groups/list-groups.css
+++ b/site/content/docs/5.3/examples/list-groups/list-groups.css
@@ -1,6 +1,7 @@
 .list-group {
+  width: 100%;
   max-width: 460px;
-  margin: 4rem auto;
+  margin-inline: 1.5rem;
 }
 
 .form-check-input:checked + .form-checked-content {
@@ -22,11 +23,12 @@
   clip: rect(0, 0, 0, 0);
 }
 .list-group-item-check:hover + .list-group-item {
-  background-color: var(--bs-light);
+  background-color: var(--bs-secondary-bg);
 }
 .list-group-item-check:checked + .list-group-item {
   color: #fff;
-  background-color: var(--bs-blue);
+  background-color: var(--bs-primary);
+  border-color: var(--bs-primary);
 }
 .list-group-item-check[disabled] + .list-group-item,
 .list-group-item-check:disabled + .list-group-item {
@@ -45,13 +47,13 @@
 }
 .list-group-radio .list-group-item:hover,
 .list-group-radio .list-group-item:focus {
-  background-color: var(--bs-light);
+  background-color: var(--bs-secondary-bg);
 }
 
 .list-group-radio .form-check-input:checked + .list-group-item {
   background-color: var(--bs-body);
-  border-color: var(--bs-blue);
-  box-shadow: 0 0 0 2px var(--bs-blue);
+  border-color: var(--bs-primary);
+  box-shadow: 0 0 0 2px var(--bs-primary);
 }
 .list-group-radio .form-check-input[disabled] + .list-group-item,
 .list-group-radio .form-check-input:disabled + .list-group-item {