CSS Scrollbars

.scroller {
  width: 300px;
  height: 100px;
  overflow-y: scroll;
  scrollbar-color: rebeccapurple green;
  scrollbar-width: thin;
}

<div class="scroller">
  Veggies es bonus vobis, proinde vos postulo essum magis kohlrabi welsh onion
  daikon amaranth tatsoi tomatillo melon azuki bean garlic. Gumbo beet greens
  corn soko endive gumbo gourd. Parsley shallot courgette tatsoi pea sprouts
  fava bean collard greens dandelion okra wakame tomato. Dandelion cucumber
  earthnut pea peanut soko zucchini.
</div>