JSFiddle - React, Tailwind, and code Playground

HTML

<div id="alt-color">
    <p> First</p>
  </div>

  <div id="main-color">
    <h2>Second</h2>
  </div>

CSS

#alt-color{
  background-color: rgba(0, 0, 255, 1);

}
#main-color{
  background-color: rgba(255, 0, 0, 1);
}