element-plus/website/demo-styles/skeleton.scss

.demo-block.demo-skeleton {

  .el-card {
    margin-bottom: 16px;
  }

  .time {
    font-size: 13px;
    color: #999;
  }

  .bottom {
    margin-top: 13px;
    line-height: 12px;
  }

  .button {
    padding: 0;
    float: right;
  }

  .image {
    &.multi-content {
      width: 400px;
      height: 267px; 
    }
    width: 100%;
    display: block;
  }

  .clearfix:before,
  .clearfix:after {
    display: table;
    content: '';
  }

  .clearfix:after {
    clear: both;
  }
}