element ui Table 自定义头部样式

<el-table-column>
   <template slot="header">
     <div class="Staked row-center">
         <img src="../image/caret-down.png" alt="">
         <span>Date & Time Staked</span>
    </div>
  </template>
  <template slot-scope="scope">
      <p>{{ scope.row.actionTime }}</p>
  </template>
</el-table-column>