message: fix button actived had 1px blank
diff: &::before {
  content: " ";
  position: absolute;
  - top: 0;
  - left: 0;
  - right: 0;
  - bottom: 0;
  + top: -1px;
  + left: -1px;
  + right: -1px;
  + bottom: -1px;
  opacity: 0;
  background-color: $black;
  border-radius: inherit; /* inherit parent's border radius */
  