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<!DOCTYPE html> <html> <head> <style> .div1 { width: 300px; height: 100px; border: 1px solid blue; } .div2 { width: 300px; height: 100px; padding: 50px; border: 1px solid red; } </style> </head> <body> <div class="div1">这个 div 较小（宽度为 300px，高度为 100px）。</div> <br> <div class="div2">这个div更大（宽度也是300px，高度也是100px）。</div> </body> </html>