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<!DOCTYPE html> <html> <head> <style> .flex-container { display: flex; height: 200px; align-items: center; background-color: DodgerBlue; } .flex-container > div { background-color: #f1f1f1; width: 100px; margin: 10px; text-align: center; line-height: 75px; font-size: 30px; } </style> </head> <body> <h1>align-items 属性</h1> <p>"align-items: center;" 将弹性项目对齐在容器的中间：</p> <div class="flex-container"> <div>1</div> <div>2</div> <div>3</div> </div> </body> </html>