<h2>鼠标点击试试~<h2>
<button class="button">Button</button>

body {
    font-size: 16px;
    font-family: 'Helvetica', 'Arial', sans-serif;
    text-align: center;
    background-color: #f8faff;
    padding: 100px;
  }
h2{
  padding-bottom:2em
}
  .button {
    display: inline-block;
    padding: 1em 2em;
    background-color: #ff0081;
    color: #fff;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    position: relative;
    box-shadow: 0 2px 25px rgba(233, 30, 99, 0.5);
    outline: 0;
    transition: transform ease-in 0.1s, background-color ease-in 0.1s, box-shadow ease-in 0.25s;
  }

  .button::before {
    position: absolute;
    content: '';
    left: -2em;
    right: -2em;
    top: -2em;
    bottom: -2em;
    pointer-events: none;
    background-repeat: no-repeat;
    background-image: radial-gradient(circle, #ff0081 20%, transparent 20%),
      radial-gradient(circle, #ff0081 20%, transparent 20%), 
  radial-gradient(circle, #ff0081 20%, transparent 20%), 
  radial-gradient(circle, #ff0081 20%, transparent 20%), 
  radial-gradient(circle, #ff0081 20%, transparent 20%), 
  radial-gradient(circle, #ff0081 20%, transparent 20%), 
  radial-gradient(circle, #ff0081 20%, transparent 20%), 
  radial-gradient(circle, #ff0081 20%, transparent 20%), 
  radial-gradient(circle, #ff0081 20%, transparent 20%),
  /*  */
  radial-gradient(circle, #ff0081 20%, transparent 20%), 
  radial-gradient(circle, #ff0081 20%, transparent 20%), 
  radial-gradient(circle, #ff0081 20%, transparent 20%),
  radial-gradient(circle, #ff0081 20%, transparent 20%), 
  radial-gradient(circle, #ff0081 20%, transparent 20%), 
  radial-gradient(circle, #ff0081 20%, transparent 20%), 
  radial-gradient(circle, #ff0081 20%, transparent 20%);
    background-position: 5% 44%, -5% 20%, 7% 5%, 23% 0%, 37% 0, 58% -2%, 80% 0%, 100% -2%, -5% 80%,
    100% 55%, 2% 100%, 23% 100%, 42% 100%, 60% 95%, 70% 96%, 100% 100%;
    background-size: 0% 0%;
    transition: background-position .5s ease-in-out, background-size .75s ease-in-out;
  }
 .button:active::before {
  transition:0s;
  background-size: 10% 10%, 20% 20%, 15% 15%, 20% 20%, 18% 18%, 10% 10%, 15% 15%, 10% 10%, 18% 18%,
    15% 15%, 20% 20%, 18% 18%, 20% 20%, 15% 15%, 10% 10%, 20% 20%;
  background-position: 18% 40%, 20% 31%, 30% 30%, 40% 30%, 50% 30%, 57% 30%, 65% 30%, 80% 32%, 15% 60%,
    83% 60%, 18% 70%, 25% 70%, 41% 70%, 50% 70%, 64% 70%, 80% 71%;
}