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html - Bootstrap 5 表单上的水平和垂直中心

问题描述

我正在尝试水平和垂直对齐引导程序表单，使其位于屏幕中间；但是，我找不到任何解决方案来帮助我。

我尝试使用这些引导类，但它们不起作用： d-flex align-items-center justify-content-center

这是我的表格：

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BmbxuPwQa2lc/FVzBcNJ7UAyJxM6wuqIj61tLrc4wSX0szH/Ev+nYRRuWlolflfl" crossorigin="anonymous">
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta2/dist/js/bootstrap.bundle.min.js" integrity="sha384-b5kHyXgcpbZJO/tY9Ul7kGkf1S0CWuKcCD38l8YkeH8z8QjE0GmW1gYU5S9FOnJ0" crossorigin="anonymous"></script>
  <title>Login</title>
</head>

<body>
  <div class="d-flex align-items-center justify-content-center">
    <form>
      <div class="mb-3 form-control-sm">
        <label for="loginInputEmail" class="form-label">Email address</label>
        <input type="email" class="form-control" id="loginInputEmail" aria-describedby="emailHelp">
        <div id="emailHelp" class="form-text">We'll never share your email with anyone else.</div>
      </div>
      <div class="mb-3 form-control-sm">
        <label for="loginInputPassword" class="form-label">Password</label>
        <input type="password" class="form-control" id="loginInputPassword">
      </div>
      <div class="mb-3 form-control-sm">
        <label for="selectAccountType" class="form-label">Account type</label>
        <select class="form-select form-select-sm" id="selectAccountType" aria-label="selectAccountType">
          <option selected>Account type</option>
          <option value="1">Arbetare</option>
          <option value="2">Företag</option>
          <option value="3">Admin</option>
        </select>
      </div>
      <div class="mb-3 form-check form-control-sm">
        <input type="checkbox" class="form-check-input" id="rememberCheck">
        <label class="form-check-label" for="rememberCheck">Remember me</label>
      </div>
      <button type="submit" class="btn btn-primary">Login</button>
    </form>
  </div>
</body>

</html>

标签： htmlcsstwitter-bootstrap

解决方案

看起来父母div需要一个垂直高度，可以使用 100% 的视口高度vh-100：

  <body>
    <!-- vh-100 here-->
    <div class="d-flex align-items-center justify-content-center vh-100">
      <form>
        <div class="mb-3 form-control-sm">
          <label for="loginInputEmail" class="form-label">Email address</label>
          <input type="email" class="form-control" id="loginInputEmail" aria-describedby="emailHelp">
          <div id="emailHelp" class="form-text">We'll never share your email with anyone else.</div>
        </div>
        <div class="mb-3 form-control-sm">
          <label for="loginInputPassword" class="form-label">Password</label>
          <input type="password" class="form-control" id="loginInputPassword">
        </div>
        <div class="mb-3 form-control-sm">
          <label for="selectAccountType" class="form-label">Account type</label>
          <select class="form-select form-select-sm" id="selectAccountType" aria-label="selectAccountType">
            <option selected>Account type</option>
            <option value="1">Arbetare</option>
            <option value="2">Företag</option>
            <option value="3">Admin</option>
          </select>
        </div>
        <div class="mb-3 form-check form-control-sm">
          <input type="checkbox" class="form-check-input" id="rememberCheck">
          <label class="form-check-label" for="rememberCheck">Remember me</label>
        </div>
        <button type="submit" class="btn btn-primary">Login</button>
      </form>
    </div>
  </body>

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