custom scrollbar w3schools

  /* width */
::-webkit-scrollbar {
  width: 10px;
}

/* Track */

  ::-webkit-scrollbar-track {
  background: #f1f1f1; 
}

/* Handle */

  ::-webkit-scrollbar-thumb {
  background: #888; 
}

  
/* Handle on hover */
::-webkit-scrollbar-thumb:hover {
  
  background: #555; 
}