SOURCE

@mixin scrollBar {
  &::-webkit-scrollbar-track-piece {
    background: rgba(0,0,0,0);
  }

  &::-webkit-scrollbar {
    width: 6px;
    height: 6px;
  }


  &::-webkit-scrollbar-thumb {
    background: rgba(144,147,153,.3);
    border-radius: 20px;
  }
}