message: fix button actived 1px blank
diff: &::before {
  content: " ";
  position: absolute;
  - top: -1px;
  - left: -1px;
  - right: -1px;
  - bottom: -1px;
  + top: 50%;
  + left: 50%;
  opacity: 0;
  - background-color: $black;
  + width: 100%;
  + height: 100%;
  + border: inherit;
  + border-color: #000;
  + background-color: #000;
  border-radius: inherit;/* inherit parent's border radius */
  + transform: translate3d(-50%, -50%, 0);
  }
  &:not([disabled]):active::before {
  