JSFiddle - React, Tailwind, and code Playground

HTML

<select id="select" size=20>
  <option value="0">Option one</option>
  <option value="1">Another option</option>
  <option value="2">Select this</option>
  <option value="3">Something good</option>
  <option value="4">Something bad</option>
</select>

CSS

select {
 width: 200px;
}


:focus {
	outline:none;
}

::-moz-focus-inner {
	border: 0;
	outline: none; 
}

select:-moz-focusring {
    color: transparent;
    text-shadow: 0 0 0 #000;
}