Merge branch 'v4-dev' of https://github.com/twbs/bootstrap into v4-dev

scss/_button-group.scss

@@ -10,6 +10,7 @@
   > .btn {
     position: relative;
     flex: 0 1 auto;
+    margin-bottom: 0;
 
     // Bring the hover, focused, and "active" buttons to the fron to overlay
     // the borders properly

scss/_input-group.scss

@@ -30,8 +30,7 @@
 .input-group .form-control {
   // Vertically centers the content of the addons within the input group
   display: flex;
-  flex-direction: column;
+  align-items: center;
-  justify-content: center;
 
   &:not(:first-child):not(:last-child) {
     @include border-radius(0);
@@ -144,8 +143,6 @@
   // element above the siblings.
   > .btn {
     position: relative;
-    // Vertically stretch the button and center its content
-    flex: 1;
 
     + .btn {
       margin-left: (-$input-btn-border-width);

scss/_navbar.scss

@@ -20,6 +20,13 @@
   display: flex;
   flex-direction: column;
   padding: $navbar-padding-y $navbar-padding-x;
+
+  @include media-breakpoint-down(nth(map-keys($grid-breakpoints), 1)) {
+    > .container {
+      margin-right: 0;
+      margin-left: 0;
+    }
+  }
 }
 
 

scss/_progress.scss

@@ -15,6 +15,7 @@
 
 .progress-bar {
   height: $progress-height;
+  line-height: $progress-height;
   color: $progress-bar-color;
   background-color: $progress-bar-bg;
 }