如何在角形材料中居中垫卡？

Question

我有一张使用棱角材料设计的登录卡，每当我在页面上运行它时，内容都会粘在页面的左侧。

我尝试使用 flex 并使用 layout-align="center center" 但我仍然无法将卡片置于页面中央

我究竟做错了什么 ？

这是我的 html：

 <mat-card class="example-card" layout="row" layout-align="center center">
  <mat-card-header>
    <div class="login-box-header" layout="row" layout-align="center center">
        <img src="https://image.ibb.co/hDqa3p/codershood.png">
    </div>
  </mat-card-header>
  <mat-card-content>
    <form class="example-form">
      <table class="example-full-width" cellspacing="0">
        <tr>
          <td>
            <mat-form-field class="example-full-width">
            <input matInput placeholder="Username" [(ngModel)]="username" name="username" required>
            </mat-form-field>
          </td>
        </tr>
        <tr>
        <td><mat-form-field class="example-full-width">
          <input matInput placeholder="Password" [(ngModel)]="password"type="password" name="password" required>
        </mat-form-field></td>
      </tr></table>
    </form>
    <mat-spinner [style.display]="showSpinner ? 'block' : 'none'"></mat-spinner>
  </mat-card-content>
  <mat-card-actions>
    <button mat-raised-button (click)="login()" color="primary">Login</button>
  </mat-card-actions>
</mat-card>

这里的内容仍然没有居中：

原文由 Chief Madog 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

使用非常简单的 Flex 修复它

.main-div{
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

并用一个类包装所有东西

<!-- Classes main-div and example-card are catagorized in .css file -->
<div class="main-div">

<mat-card class="example-card">
  <mat-card-header>
    <div class="login-box-header">
        <!-- Src image is temporary hosted in image.ibb-->
        <img src="https://image.ibb.co/hDqa3p/codershood.png">
    </div>
  </mat-card-header>
  <mat-card-content>
    <form class="example-form">
      <table class="example-full-width" cellspacing="0">
        <tr>
          <td>
            <mat-form-field class="example-full-width">
            <input matInput placeholder="Username" [(ngModel)]="username" name="username" required>
            </mat-form-field>
          </td>
        </tr>
        <tr>
        <td><mat-form-field class="example-full-width">
          <input matInput placeholder="Password" [(ngModel)]="password"type="password" name="password" required>
        </mat-form-field></td>
      </tr></table>
    </form>
    <mat-spinner [style.display]="showSpinner ? 'block' : 'none'"></mat-spinner>
  </mat-card-content>
  <mat-card-actions>
    <button mat-raised-button (click)="login()" color="primary">Login</button>
  </mat-card-actions>
</mat-card>

原文由 Chief Madog 发布，翻译遵循 CC BY-SA 4.0 许可协议