how to style scrollbar html code example

Example: css scrollbar

::-webkit-scrollbar {
  width: 10px;
}
  ::-webkit-scrollbar-track {
  background: #f1f1f1; 
}
  ::-webkit-scrollbar-thumb {
  background: #888; 
    border-radius:10px;
}
::-webkit-scrollbar-thumb:hover {
  
  background: #555; 
}