JSFiddle - React, Tailwind, and code Playground

HTML

<textarea>
  add
  some
  text
  long
  enough
  in
  order
  to
  see
  the
  text
  behavior
  while
  scrolling
</textarea>

CSS

textarea {
-webkit-box-shadow: inset 0px 2px 0px 3px grey;
-moz-box-shadow: inset 0px 2px 0px 3px grey;
box-shadow: inset 0px 2px 0px 3px grey;
height: 200px;
overflow-y: scroll;
background:#111;
color:#fff
}