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<!DOCTYPE html> <html> <head> <style> * { box-sizing: border-box; } .flex-container { display: flex; flex-direction: row; font-size: 30px; text-align: center; } .flex-item-left { background-color: #f1f1f1; padding: 10px; flex: 50%; } .flex-item-right { background-color: dodgerblue; padding: 10px; flex: 50%; } /* 响应式布局 - 制作一列布局而不是两列布局 */ @media (max-width: 800px) { .flex-container { flex-direction: column; } } </style> </head> <body> <h1>响应式弹性盒</h1> <p>"flex-direction: row;" 水平堆叠弹性项目（从左到右）。</p> <p>"flex-direction: column;" 将弹性项目垂直堆叠（从上到下）。<</p> <p><b>调整浏览器窗口大小以查看当屏幕尺寸为 800 像素宽或更小时方向会发生变化。</b></p> <div class="flex-container"> <div class="flex-item-left">1</div> <div class="flex-item-right">2</div> </div> </body> </html>