优化代码

src/views/system/user.vue

@@ -63,7 +63,7 @@
                             :data="roleOptions"
                             multiple
                             :render-after-expand="false"
-                            style="width: 240px"
+                            style="width: 100%"
                             @change="changeRole"
                         />
                     </el-form-item>