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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap 实例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="container mt-3"> <h2>居中对齐自身</h2> <p>使用 .align-self-*-center 类在不同屏幕上的 flex 容器的中心对齐 flex 项目。</p> <p>请调整浏览器窗口大小来查看效果。<b>注释：</b>align-self-stretch 是默认的。</p> <p><code>.align-self-center</code>:</p> <div class="d-flex bg-light" style="height:150px"> <div class="p-2 border">Flex item 1</div> <div class="p-2 border align-self-center">Flex item 2</div> <div class="p-2 border">Flex item 3</div> </div> <br> <p><code>.align-self-sm-center</code>:</p> <div class="d-flex bg-light" style="height:150px"> <div class="p-2 border">Flex item 1</div> <div class="p-2 border align-self-sm-center">Flex item 2</div> <div class="p-2 border">Flex item 3</div> </div> <br> <p><code>.align-self-md-center</code>:</p> <div class="d-flex bg-light" style="height:150px"> <div class="p-2 border">Flex item 1</div> <div class="p-2 border align-self-md-center">Flex item 2</div> <div class="p-2 border">Flex item 3</div> </div> <br> <p><code>.align-self-lg-center</code>:</p> <div class="d-flex bg-light" style="height:150px"> <div class="p-2 border">Flex item 1</div> <div class="p-2 border align-self-lg-center">Flex item 2</div> <div class="p-2 border">Flex item 3</div> </div> <br> <p><code>.align-self-xl-center</code>:</p> <div class="d-flex bg-light" style="height:150px"> <div class="p-2 border">Flex item 1</div> <div class="p-2 border align-self-xl-center">Flex item 2</div> <div class="p-2 border">Flex item 3</div> </div> <br> <br> <p><code>.align-self-xxl-center</code>:</p> <div class="d-flex bg-light" style="height:150px"> <div class="p-2 border">Flex item 1</div> <div class="p-2 border align-self-xxl-center">Flex item 2</div> <div class="p-2 border">Flex item 3</div> </div> <br> </div> </body> </html>