message: Fixed focus outline
diff: button:focus {
  box-shadow: 0 0 0 2px rgba(149, 189, 243, 0.5);
  + position: relative;
  + margin-right: -1px;
  + border-right: 1px solid $gray4;
  }
  button:hover {
  border-bottom-left-radius: 6px;
  border-top-left-radius: 6px;
  }
  +
  + button:last-child:focus {
  + margin-right: 0;
  + }
  }
  }
  