mat-table -如何更新列宽

<mat-table [dataSource]="dataSource">
  <!-- 定义表头 -->
  <ng-container matColumnDef="column1">
    <mat-header-cell *matHeaderCellDef>列1</mat-header-cell>
    <mat-cell *matCellDef="let element"> {{element.column1}} </mat-cell>
  </ng-container>

  <!-- 定义表体 -->
  <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
  <mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>
</mat-table>

import { Component } from '@angular/core';

@Component({
  selector: 'app-table',
  templateUrl: './table.component.html',
  styleUrls: ['./table.component.css']
})
export class TableComponent {
  displayedColumns: string[] = ['column1'];
  dataSource = [
    { column1: '数据1' },
    { column1: '数据2' },
    { column1: '数据3' }
  ];
}

.mat-column-column1 {
  flex: 1;
}