message: Ensure ButtonGroup children have appropriate margins
  Safari has a 2px margin by default on `button`s, so this is necessary to
  get `ButtonGroup` to render correctly on Safari.
diff: @@ -12,6 +12,12 @@ const ButtonGroup = styled(Box)`
  :first-child {
  border-top-left-radius: 3px;
  border-bottom-left-radius: 3px;
  + margin-right: 0;
  + }
  +
  + :not(:first-child) {
  + margin-left: 0;
  + margin-right: 0;
  }
  :last-child {
  