/* Works on Firefox */
* {
  scrollbar-width: auto;
  scrollbar-color: #ffcc99 #3399cc;
}

/* Works on Chrome, Edge, and Safari */
*::-webkit-scrollbar {
  width: 18px;
}

*::-webkit-scrollbar-track {
  background: #3399cc;
}

*::-webkit-scrollbar-thumb {
  background-color: #ffcc99;
  border-radius: 10px;
  border: 3px solid #3399cc;
}