wave.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    body
  {
    background-color: gray;
  }
#wave-button {
  position: relative;
  width: 200px;
  height: 50px;
  border: none;
  border-radius: 25px;
  background-color: #4CAF50;
  color: white;
  font-size: 16px;
  cursor: pointer;
  overflow: hidden;
  margin: auto; 
  left:300px;
  top: 200px;
}

#wave-button::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 25px;
  background-color: rgba(255, 255, 255, 0.3);
  opacity: 0;
  transition: opacity 0.5s ease-out;
}

.wave {
  position: absolute;
  width: 50px;
  height: 50px;
  border-radius: 25px;
  background-color: rgba(0, 0, 0, 0.3);
  transform: scale(0);
  animation: wave 1s linear;
  animation-fill-mode: forwards;
}

@keyframes wave {
  0% {
    transform: scale(0);
    opacity: 1;
  }
  100% {
    transform: scale(10);
    opacity: 0;
  }
}

  </style>
</head>
<body>
  <button id="wave-button">Click me</button>

</body>
<script>
  const waveButton = document.getElementById("wave-button");

waveButton.addEventListener("click", function() {
  const wave = document.createElement("span");
  wave.classList.add("wave");
  this.appendChild(wave);
  setTimeout(() => wave.remove(),600);
});

</script>
</html>