el-table多选表头复选框不对齐

el-table多选表头复选框不对齐

<el-table
          ref="multipleTable"
          :data="DataList"
          tooltip-effect="dark"
          style="width: 100%"
          height="250"
          @selection-change="handleSelectionChange">
    <el-table-column
                     type="selection"
                     width="55" >
    </el-table-column>
    <el-table-column
                     prop="jskMingcheng"
                     label="姓名"
                     width="120">
    </el-table-column>
    <el-table-column
                     prop="jskDanwei"
                     label="单位"
                     show-overflow-tooltip>
    </el-table-column>
</el-table>

表头的复选框和其他行的没有对齐，改法：给 el-table-column 加上 align="center"

<el-table-column
                 type="selection"
                 width="55" 
                 align="center">
</el-table-column>

效果：