JSFiddle - React, Tailwind, and code Playground

HTML

<select>
  <option class="yellow" value="1">Yellow</option>
  <option class="red" value="2">Red</option>
  <option class="green" value="3">Green</option>
</select>

CSS

select option:nth-child(1) {
        background: yellow;
    }
    select option:nth-child(2) {
        background: red;
    }
    select option:nth-child(3) {
        background: green;
    }