xxxxxxxxxx<html><head><meta charset="utf-8"> <title>W3Cschool教程(w3cschool.cn)</title> <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">两个 div 现在是一样大小的!</div><br><div class="div2">W3Cschool教程!</div></body></html>