message: Better overlay button display
diff: | Overlay Button
  .UI__section__component__rendered.UI__section__component__rendered--spaced( style='background-color: black; padding: 1em;' )
  - button.Button.Button--overlay Connect &rarr;
  button.Button.Button--overlay Source
  + button.Button.Button--overlay Connect &rarr;
  - br
  + hr.Base
  - button.Button.Button--overlay( data-state='loading' ) Connect &rarr;
  button.Button.Button--overlay Source
  + button.Button.Button--overlay( data-state='loading' ) Connect &rarr;
  - br
  + hr.Base
  - button.Button.Button--overlay( data-state='error' ) Error
  button.Button.Button--overlay Source
  + button.Button.Button--overlay( data-state='error' ) Error
  pre.Type
  | button.Button.Button--overlay Connect &rarr;
  | button.Button.Button--divider.Button--closed Follow
  | button.Button.Button--divider.Button--closed Connect &rarr;
  -
  .UI__section__component
  h6.Type
  | Divider Button Sizes
  