Initial version

themes/zen/assets/sass/components/button/_button.scss

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+// 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.
+
+.button,
+%button,
+button,
+[type='button'],
+[type='reset'],
+[type='submit'] {
+  @extend %button--disabled;
+  // Some styles don't apply to <a> links since they are inline elements by default.
+  display: inline-block;
+  font-family: var(--ff-headings);
+  text-decoration: none;
+  text-align: center;
+  width: fit-content;
+  margin-right: 1rem;
+  margin-bottom: 1rem;
+  padding: .2rem 1rem;
+  // Improve usability and consistency of cursor style between image-type `input` and others.
+  cursor: pointer;
+  color: var(--color-button-text);
+  background-color: var(--color-button);
+  border: 1px solid var(--color-button);
+  border-radius: var(--radius-s);
+
+  &:hover,
+  &:focus-visible,
+  &:active {
+    // Override any link underlines and color changes.
+    text-decoration: none;
+    color: var(--color-button-text-hover);
+    background-color: var(--color-button-hover);
+  }
+}
+
+// Add button variations here.
+.button,
+%button {
+  &--small {
+    font-size: var(--fs-xs);
+    margin-right: .5rem;
+    margin-bottom: .5rem;
+    padding: .2rem .75rem;
+  }
+
+  &--alt {
+    color: var(--color-button-text-hover);
+    background-color: var(--color-button-hover);
+
+    &:hover,
+    &:focus-visible,
+    &:active {
+      color: var(--color-button-text);
+      background-color: var(--color-button);
+    }
+  }
+
+  &--outline {
+    color: var(--color-button);
+    background-color: var(--color-button-text);
+    border-color: var(--color-button);
+
+    &:hover,
+    &:focus-visible,
+    &:active {
+      color: var(--color-button-text);
+      background-color: var(--color-button);
+    }
+  }
+
+  &--shadow {
+    &:hover {
+      box-shadow: 2px 2px 5px 1px var(--color-button-hover);
+    }
+
+    &:active {
+      box-shadow: inset 2px 2px 5px 1px var(--color-button);
+    }
+  }
+}
+
+// The disabled variation should always go last, so that it overrides any
+// other variations.
+%button--disabled[disabled] {
+  @extend %disabled;
+  background-color: var(--color-grey-extra-light);
+  border: 1px solid var(--color-button-disabled);
+  background-image: none;
+  text-shadow: none;
+}