xxxxxxxxxx<html><head><meta charset="utf-8"> <title>W3Cschool教程(w3cschool.cn)</title> <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">这个是个较小的框 (width 为 300px ，height 为 100px)。</div><br><div class="div2">这个是个较大的框 (width 为 300px ，height 为 100px)。</div></body></html>