Updated the normalise css.

sass/components/button/_button.scss

@@ -12,6 +12,9 @@
 //
 // Style guide: forms.button
 
+// 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
+//    controls in Android 4.
+// 2. Correct the inability to style clickable types in iOS and Safari.
 .button,
 %button,
 button,
@@ -19,6 +22,7 @@ button,
 html [type='button'],
 [type='reset'],
 [type='submit'] {
+  // sass-lint:disable no-vendor-prefixes
   -moz-appearance: button;
   -webkit-appearance: button; // 2
 }
@@ -30,12 +34,9 @@ button,
 [type='reset'],
 [type='submit'] {
   @extend %button--disabled;
-  @include typeface(headings);
-  @include margin-right(.75);
-  @include margin-bottom(.75);
   // Some styles don't apply to <a> links since they are inline elements by default.
   display: inline-block;
-  padding: 2px 10px;
+  padding: 2px 6px;
   // Address Firefox 4+ setting `line-height` on `input` using `!important` in
   // the UA stylesheet. And prevent its "line-height: normal" rule below from
   // breaking the "appearance: button" styling on the input elements.
@@ -44,15 +45,8 @@ button,
   // Improve usability and consistency of cursor style between image-type `input` and others.
   cursor: pointer;
   color: color(button);
-  text-align: center;
-  background-image: linear-gradient(#f6f6f6, #e2e2e2);
-  border: 1px solid #e4e4e4;
-  border-left-color: #d2d2d2;
-  border-right-color: #d2d2d2;
-  border-bottom-color: #b4b4b4;
-  border-radius: 2px;
-
 
+  // sass-lint:disable no-vendor-prefixes
   // Remove the inner border and padding in Firefox.
   &::-moz-focus-inner {
     border-style: none;
@@ -63,6 +57,7 @@ button,
   &:-moz-focusring {
     outline: 1px dotted ButtonText;
   }
+  // sass-lint:enable no-vendor-prefixes
 
   &:hover,
   &:focus,
@@ -71,13 +66,6 @@ button,
     text-decoration: none;
     color: color(button);
   }
-
-  &:active {
-    border-color: #555;
-    text-shadow: color(button) 0 -1px 0;
-    background: color(grey-dark);
-    color: color(text-bg);
-  }
 }
 
 // Add button variations here.
@@ -94,10 +82,6 @@ button,
   // Re-set default cursor for disabled elements.
   cursor: default;
   color: color(button-disabled);
-  background-color: color(grey-extra-light);
-  border-color: color(grey-extra-light);
-  background-image: none;
-  text-shadow: none;
 
   &:hover,
   &:focus,