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<!DOCTYPE html> <html> <head> <style> div.ex1 { width: 300px; background-color: yellow; } div.ex2 { width: 300px; padding: 25px; background-color: lightblue; } </style> </head> <body> <h2>填充和元素宽度</h2> <div class="ex1">这个 div 是 300px 宽。</div> <br> <div class="ex2">这个 div 的宽度是 350px，尽管它在 CSS 中被定义为 300px。</div> </body> </html>