        <style>
            *{margin: 0; padding: 0;}
            nav{width: 1200px;margin: auto;}
            
            ul{list-style: none;}
            
            ul li{ width: 120px; background: #0080cd; float: left; height: 35px; line-height: 35px; text-align: center; margin-right: 2px; position: relative;}
            
            ul li:hover{ background: #0e6ea8;}
            
            ul li a{color: #fff; text-decoration: none; font-family: sans-serif; display: block;}
            
            ul li ul li{ border-top: 1px solid #fff;}
            
            ul li ul{display: none;}
            
            ul li:hover ul{ display: block;}
            
            ul li ul .itam-2{position: absolute; left: 122px; top: 0; display: none;}
            
            ul li ul li:last-child:hover .itam-2{display: block;}
            
            section{width: 800px; margin: auto; clear: both; background: #e1e1e1;}
            
            
            
        </style>