引导程序4不工作的垂直中心[重复]

Question

我试图使用bootstrap 4集中一个面板，我使用了Align-Items-Centre，但我没有成功。我已经添加了h-100，仍然继续在页面顶部的标题。有人知道会出什么问题吗？我在用angular 4和bootstrap

<div class='container h-100'>
  <div class='row h-100 justify-content-center align-items-center'>
    <div class='mx-auto col-sm-6' style="border: 2px solid red"  >
      <h3 class="text-center">Título da Aplicação</h3>
      <h4 class="text-center">Subtítulo da Aplicação</h4>
    </div>
  </div>
</div>

`

Answer 1

你的想法是对的！问题是，H-100类添加了height:100%，并且在父级上没有固定的容器继承height。

要解决这个问题，我建议从.container中删除H-100类，并手动指定100VH，这表示视口高度的100%。

.container {
  height: 100vh;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

<div class='container'>
  <div class='row h-100 justify-content-center align-items-center'>
    <div class='mx-auto col-sm-6' style="border: 2px solid red">
      <h3 class="text-center">Título da Aplicação</h3>
      <h4 class="text-center">Subtítulo da Aplicação</h4>
    </div>
  </div>
</div>