JSFiddle - React, Tailwind, and code Playground

HTML

<select size="5">
<option>aaa</option>
  <option>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</option>
  <option>aaa</option>
</select>

CSS

select {
  overflow: auto;
  width: 20%;
}

option {
  width: 100%;
}