JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <select>
        <option>1</option>
        <option>2</option>
    </select>
</div>

CSS

select,
option {
    width: 200px;}

div:before {
    content: '#';
    display:inline-block;
    width: 18px;
    height: 18px;
    background: black;}