4 files changed, 3 insertions, 12 deletions
diff --git a/docs/4.0/examples/cover/cover.css b/docs/4.0/examples/cover/cover.css
index ebf135f5c..108db2235 100644
--- a/docs/4.0/examples/cover/cover.css
+++ b/docs/4.0/examples/cover/cover.css
@@ -34,9 +34,6 @@ body {
   display: -ms-flexbox;
   display: -webkit-box;
   display: flex;
-  -ms-flex-pack: center;
-  -webkit-box-pack: center;
-  justify-content: center;
   color: #fff;
   text-shadow: 0 .05rem .1rem rgba(0, 0, 0, .5);
   box-shadow: inset 0 0 5rem rgba(0, 0, 0, .5);
diff --git a/docs/4.0/examples/cover/index.html b/docs/4.0/examples/cover/index.html
index 9a641b15b..0a0effca5 100644
--- a/docs/4.0/examples/cover/index.html
+++ b/docs/4.0/examples/cover/index.html
@@ -18,7 +18,7 @@
 
   <body class="text-center">
 
-    <div class="cover-container d-flex h-100 p-3 mx-auto flex-column">
+    <div class="cover-container d-flex w-100 h-100 p-3 mx-auto flex-column">
       <header class="masthead mb-auto">
         <div class="inner">
           <h3 class="masthead-brand">Cover</h3>
diff --git a/docs/4.0/examples/floating-labels/floating-labels.css b/docs/4.0/examples/floating-labels/floating-labels.css
index 1eb04973a..85c7babcf 100644
--- a/docs/4.0/examples/floating-labels/floating-labels.css
+++ b/docs/4.0/examples/floating-labels/floating-labels.css
@@ -13,11 +13,8 @@ body {
   display: -webkit-box;
   display: flex;
   -ms-flex-align: center;
-  -ms-flex-pack: center;
   -webkit-box-align: center;
   align-items: center;
-  -webkit-box-pack: center;
-  justify-content: center;
   padding-top: 40px;
   padding-bottom: 40px;
   background-color: #f5f5f5;
@@ -27,7 +24,7 @@ body {
   width: 100%;
   max-width: 420px;
   padding: 15px;
-  margin: 0 auto;
+  margin: auto;
 }
 
 .form-label-group {
diff --git a/docs/4.0/examples/sign-in/signin.css b/docs/4.0/examples/sign-in/signin.css
index d31b6098a..7244a54ae 100644
--- a/docs/4.0/examples/sign-in/signin.css
+++ b/docs/4.0/examples/sign-in/signin.css
@@ -8,11 +8,8 @@ body {
   display: -webkit-box;
   display: flex;
   -ms-flex-align: center;
-  -ms-flex-pack: center;
   -webkit-box-align: center;
   align-items: center;
-  -webkit-box-pack: center;
-  justify-content: center;
   padding-top: 40px;
   padding-bottom: 40px;
   background-color: #f5f5f5;
@@ -22,7 +19,7 @@ body {
   width: 100%;
   max-width: 330px;
   padding: 15px;
-  margin: 0 auto;
+  margin: auto;
 }
 .form-signin .checkbox {
   font-weight: 400;