JSFiddle - React, Tailwind, and code Playground

HTML

<p>
  <input type="radio" name="cor" value="1" id="c1"><label for="c1">Vermelha</label><br>
  <input type="radio" name="cor" value="2" id="c2" checked><label for="c2">Verde</label><br>
  <input type="radio" name="cor" value="3" id="c3"><label for="c3">Azul</label>
</p>

CSS

input[type="radio"]:checked + label { color: magenta; }