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<!DOCTYPE html> <html> <head> <style> .center { height: 200px; position: relative; border: 3px solid green; } .center p { margin: 0; position: absolute; top: 50%; left: 50%; -ms-transform: translate(-50%, -50%); transform: translate(-50%, -50%); } </style> </head> <body> <h2>居中</h2> <p>在此示例中，我们使用 positioning 和 transform 属性使 div 元素在垂直和水平方向上居中：</p> <div class="center"> <p>我垂直和水平居中。</p> </div> </body> </html>