技術標籤：csscss3

效果

程式碼

<div>
  <button class="btn">點選</button>
</div>

<style>
  .btn {
    position: relative;
    overflow: hidden;
    background-color: #000;
    border: 1px solid #00ffff;
    color: #fff;
    padding: 4px 10px;
    outline: none;
  }

  .btn:after
 
 {
    content: "";
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    background-image: radial-gradient(circle, #fff 10%, transparent 10.01%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform
 
: scale(10, 10);
    opacity: 0;
    transition: transform 0.3s, opacity 0.5s;
  }

  .btn:active:after {
    transform: scale(0, 0);
    opacity: 0.6;
    transition: 0s;
  }
</style>