adjust button column width

src/views/gambleMember/history/index.vue

             <span>{{moment(scope.row['GambleGame-Bucket'].createdAt)}}</span>
           </template>
         </el-table-column>
-        <el-table-column align="center" label="操作">
+        <el-table-column align="center" label="操作" width="250">
           <template slot-scope="scope">
               <el-button type="primary" size="mini" icon="el-icon-tickets" @click="handlePersonDetail(scope.row)">個人明細</el-button>  
               <el-button type="primary" size="mini" icon="el-icon-tickets" @click="handleGameDetail(scope.row)">此場明細</el-button>