四个边框的效果 - 在线编辑器

          <style>
  .loader-4 {
    border: 16px solid #f3f3f3;
    border-radius: 50%;
    border-top: 16px solid blue;
    border-right: 16px solid green;
    border-bottom: 16px solid red;
    border-left: 16px solid pink;
    width: 120px;
    height: 120px;
    -webkit-animation: spin 2s linear infinite;
    animation: spin 2s linear infinite;
  }

  @-webkit-keyframes spin {
    0% {
      -webkit-transform: rotate(0deg);
    }
    100% {
      -webkit-transform: rotate(360deg);
    }
  }

  @keyframes spin {
    0% {
      transform: rotate(0deg);
    }
    100% {
      transform: rotate(360deg);
    }
  }
</style>

<div class="loader-4"></div>
        