element-ui中Select 选择器列表内容居中

<el-select class="my-el-select" v-model="tenantCont" placeholder="请输入机构标识">
     <el-option-group
         v-for="group in options"
         :key="group.label"
         :label="group.label">
            <el-option
                v-for="item in group.options"
                :key="item.value"
                :label="item.label"
                 :value="item.value">
             </el-option>
       </el-option-group>
 </el-select>

// 内容居中
.el-scrollbar .el-select-group__wrap /deep/ .el-select-dropdown__item{
    text-align: center !important;
}