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<!DOCTYPE html> <html> <head> <style> .center { display: flex; justify-content: center; align-items: center; height: 200px; border: 3px solid green; } </style> </head> <body> <h1>Flexbox 居中</h1> <p>将 justify-content 和 align-items 属性都设置为 <em>center</em> 的容器会将项目居中对齐（在两个轴上）。</p> <div class="center"> <p>我垂直和水平居中。</p> </div> </body> </html>