JSFiddle - React, Tailwind, and code Playground

HTML

<form>
 	<select id = "id">
		<option value = "a">a</option>
		<option value = "b">b</option>
		<option value = "c">c</option>
		<option value = "d">d</option>
	</select>   
</form>

CSS

select { color: red; }
option:not(:checked) { color: black; }
/*option:checked { color: green; }*/