element deep不生效

    <el-dialog title="1" :visible.sync="selCustomShow" custom-class="dialogCustom" width="900px">
      <div class="custom-body">
        <el-tabs v-model="activeNameTab" type="border-card" style="margin-bottom:5px;" @tab-click="handleClick">
          <el-tab-pane label="2" name="2"></el-tab-pane>
          <el-tab-pane label="3" name="3"></el-tab-pane>
        </el-tabs>
      </div>
     </el-dialog>

不生效的用法

    .dialogCustom{
     /deep/ .el-tabs__content{
        display: none;
      }
    }

生效的用法

    /deep/ .dialogCustom{
      .el-tabs__content{
        display: none;
      }
    }