JSFiddle - React, Tailwind, and code Playground

HTML

<button class="exit exitPage2" type="button"></button>
      <button class="exit " type="button"></button>
      
      <div class="exit"></div>

CSS

.exit {
  position: relative;
  background: red;
  width: 47px;
  height: 47px;
  border-radius: 4px;
  border-width: 4px;
  border-style: solid;
  border-top-color: rgba(255, 255, 255, 0.5);
  border-left-color: rgba(0, 0, 0, 0.3);
  border-right-color: rgba(0, 0, 0, 0.3);
  border-bottom-color: rgba(0, 0, 0, 0.8);
 
}

.exit.exitPage2 {
  background: red;
}