用前端代码写一个会动的爱心

<p>我可以帮你写一个会动的爱心，用HTML和CSS来实现：</p>
<style>
  .heart {
    position: relative;
    width: 100px;
    height: 90px;
    background: #000;
    animation: beat 1s infinite;
  }
  .heart:before, .heart:after {
    position: absolute;
    content: "";
    left: 50px;
    top: 0;
    width: 50px;
    height: 80