<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title></title> <style type="text/css"> #nav{ 80%; height: 100px; /*border: 8px solid red;*/ margin: 0px auto; margin: 上 右 下 左; /*overflow: scroll;*/ } .nav-banner{ /*border: 4px solid black;*/ text-align: center; line-height: 100px; 20%; height: 100px; float: left; position: relative; } .nav-banner:hover{ background-color: #000000; color: white; cursor: pointer; } </style> </head> <body> <div id="nav"> <div class="nav-banner">第1导航</div> <div class="nav-banner">第2导航</div> <div class="nav-banner">第3导航</div> <div class="nav-banner">第4导航</div> <div class="nav-banner">第5导航</div> </div> </body> </html>