message: Update button styles
diff: @@ -12,12 +12,12 @@ Buttons express what action will occur when the user clicks it. Buttons are used
  <table>
  <tr>
  - <th width={160}>Primary</th>
  - <td>For the principle call to action on the page.</td>
  + <th>Default</th>
  + <td>When an action requires primary dominance on the page.</td>
  </tr>
  <tr>
  - <th>Secondary</th>
  - <td>For secondary actions on each page.</td>
  + <th>Ghost button</th>
  + <td>When an action does not require primary dominance on the page.</td>
  </tr>
  <tr>
  <th>Button with icon</th>
  @@ -26,10 +26,20 @@ Buttons express what action will occur when the user clicks it. Buttons are used
  always paired with text.
  </td>
  </tr>
  + <tr>
  + <th>Icon button</th>
  + <td>
  + Usually used associated with a dropdown menu, settings panel.
  + </td>
  + </tr>
  <tr>
  <th>Disabled button</th>
  <td>Use when the user cannot proceed until an input is collected.</td>
  </tr>
  + <tr>
  + <th>Danger button</th>
  + <td>When an action has potentially destructive effects on the user's data (delete, remove, etc).</td>
  + </tr>
  <tr>
  <th>Set of buttons</th>
  <td>
  @@ -38,12 +48,4 @@ Buttons express what action will occur when the user clicks it. Buttons are used
  Positive action buttons should be on the right.
  </td>
  </tr>
  - <tr>
  - <th>Ghost button</th>
  - <td>When an action does not require primary dominance on the page.</td>
  - </tr>
  - <tr>
  - <th>Small button</th>
  - <td>Use when there is not enough vertical space for a regular sized button.</td>
  - </tr>
  </table>
  