Merge branch 'v4-dev' into stretched-link

scss/_button-group.scss

@@ -9,7 +9,7 @@
 
   > .btn {
     position: relative;
-    flex: 0 1 auto;
+    flex: 1 1 auto;
 
     // Bring the hover, focused, and "active" buttons to the front to overlay
     // the borders properly

scss/_reboot.scss

@@ -50,7 +50,7 @@ article, aside, figcaption, figure, footer, header, hgroup, main, nav, section {
 //
 // 1. Remove the margin in all browsers.
 // 2. As a best practice, apply a default `background-color`.
-// 3. Set an explicit initial text-align value so that we can later use the
+// 3. Set an explicit initial text-align value so that we can later use
 //    the `inherit` value on things like `<th>` elements.
 
 body {

scss/_spinners.scss

@@ -10,8 +10,6 @@
   display: inline-block;
   width: $spinner-width;
   height: $spinner-height;
-  overflow: hidden;
-  text-indent: -999em;
   vertical-align: text-bottom;
   border: $spinner-border-width solid currentColor;
   border-right-color: transparent;
@@ -42,8 +40,6 @@
   display: inline-block;
   width: $spinner-width;
   height: $spinner-height;
-  overflow: hidden;
-  text-indent: -999em;
   vertical-align: text-bottom;
   background-color: currentColor;
   border-radius: 50%;