xxxxxxxxxx<html><meta charset="utf-8"><title>编程狮(w3cschool.cn)</title><style> #box {background-color:#eee; } #box p {margin-top: 20px;margin-bottom: 20px; text-align:center; }</style><body> <div id="box"> <p>p对象中的内容</p> </div></body>