Added form normalisation and button style. Removed IE 7 fixes.

sass/components/button/_button.scss

@@ -0,0 +1,108 @@
+// Button
+//
+// In addition to the default styling of `<button>` and
+// `<input type="submit|image|reset|button">` elements, the `.button` class and
+// its variants can apply buttons styles to various elements (like an `<a>`
+// link).
+//
+// :hover  - Hover styling.
+// :active - Depressed button styling.
+//
+// Markup: button.twig
+//
+// Style guide: forms.button
+
+.button,
+%button,
+button,
+// 1
+html [type='button'],
+[type='reset'],
+[type='submit'] {
+  -moz-appearance: button;
+  -webkit-appearance: button; // 2
+}
+
+.button,
+%button,
+button,
+[type='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;
+  // 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.
+  line-height: inherit;
+  text-decoration: none;
+  // 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;
+
+
+  // Remove the inner border and padding in Firefox.
+  &::-moz-focus-inner {
+    border-style: none;
+    padding: 0;
+  }
+
+  // Restore the focus styles unset by the previous rule.
+  &:-moz-focusring {
+    outline: 1px dotted ButtonText;
+  }
+
+  &:hover,
+  &:focus,
+  &:active {
+    // Override any link underlines and color changes.
+    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.
+.button,
+%button {
+  &--variant-name {
+    // Add styles here.
+  }
+}
+
+// The disabled variation should always go last, so that it overrides any
+// other variations.
+%button--disabled[disabled] {
+  // 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,
+  &:active {
+    // Override any link underlines and color changes.
+    color: color(button-disabled);
+  }
+}