JSFiddle - React, Tailwind, and code Playground

HTML

<textarea name="" id="" cols="30" rows="10"></textarea>

CSS

textarea {
  border: 0;
  outline: 1px solid #000000;
  /* border: 1px solid #000000; */
}
textarea:hover {
  outline-width: 2px;
  /* border-width: 2px; */
}