add scrollbar to dropdown css code example
Example: css dropdown menu with scrollbar
/* Note that I added a screen width limit to 600px
and fixed the menu height in 200px (with scrollbars),
so you can adjust those numbers the way you want. */
@media (max-width: 600px) {
#menu{
max-height: 200px;
overflow-x: hidden;
overflow-y: auto;
}
}