::-webkit-scrollbar {
  width: 8px
}

::-webkit-scrollbar-track {
  background-color: #fff
}
 
::-webkit-scrollbar-thumb {
  border-radius: 8px
  background-color: rgba(0,0,0,0.15)
}

/* reference: https://css-tricks.com/custom-scrollbars-in-webkit/ */