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<!DOCTYPE html> <html> <head> <style> .div1 { width: 300px; height: 100px; border: 1px solid blue; box-sizing: border-box; } .div2 { width: 300px; height: 100px; padding: 50px; border: 1px solid red; box-sizing: border-box; } </style> </head> <body> <div class="div1">现在两个 div 的大小相同！</div> <br> <div class="div2">万岁！</div> </body> </html>