vue element ui中el-step descripti

<el-steps :active="followActive" >
    <el-step v-for="(value, key) in followOptions"
      :key="key"
      :title="value.title"
      description="value.description">
      <template slot="description" >
        <span>{{value.actualTime}}<br/>{{value.planTime}}</span>
      </template>
    </el-step>
</el-steps>

vue elementui steps组件在步骤条中添加自定义样式内容