纯css实现太极动画效果

效果，其实是会转的

<div class="taiji"></div>

 * {
    margin: 0px;
    background: #f2f2f2;
  }

  .taiji {
    display: flex; 
    align-items: center; 
    width: 200px;
    height: 200px;
    margin: 10px auto;
    border-radius: 50%;
    background: linear-gradient(black 50%, white 50%);
    animation: taiji 4s infinite linear; /*动画属性*/
  }

  .taiji:before,
  .taiji:after {
    content: ""; /*激活*/
    display: block; /*显示*/
    width: 100px;
    height: 100px;
    border-radius: 50%;
  }

  .taiji:before {
    background: radial-gradient(black 25%, white 25%);
  }

  .taiji:after {
    background: radial-gradient(white 25%, black 25%);
  }

  @keyframes taiji { /*from-to 0%-100%*/
    from {
      transform: rotate(0deg);
    }
    to {
      transform: rotate(360deg);
    }
  }