:active (JS)

by Sasabee

HTML

<div id="btn"></div>

CSS

body {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #000;
  height: 100vh;
}

div {
  cursor: pointer;
  background-color: #f00;
  width: 300px;
  height: 100px;
  font-size: 24px;
  font-weight: bold;
  color: #000;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  position: relative;
}

div::before {
  content: "BUTTON";
}

@keyframes hado {
  to {
    width: 700px;
    height: 700px;
    opacity: 0;
  }
}

.anim::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 0;
  height: 0;
  opacity: 1;
  background-color: rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  animation: 1s hado;
}

JavaScript

const el = document.getElementById('btn');
el.addEventListener('click', (e)=>e.target.classList.add('anim'));
el.addEventListener('animationend', (e)=>e.target.classList.remove('anim'));