.drop-down{
            /*position: relative;*/
		
        }
		.drop-down a{

        }
        .drop-down-content{
            padding: 0;
            display: none;
           position: absolute;
		   z-index:999;
		   background-color:#f0f0f0;
	
        }
		
		.drop-down-content li{
		width:100px;	
        }

        .drop-down-content li:hover a{
		color:#333333;
		font-size:16px;
		line-height:30px;
		height:30px;
        }
		.drop-down-content li a{
		font-size:16px;
		line-height:30px;
		height:30px;
        }
        .nav .drop-down:hover .drop-down-content{
            display: block;
			font-size:12px;
        }

   .nav li li > a {
   line-height:30px;
   padding-top:10px;
   padding-bottom:10px;
   padding-left:0px;
   padding-right:0px;
 

  
}
.lei{ width:auto; display:none;}
.sj{ display:none}
@media screen and (max-width: 641px) {
.lei{ width:auto; display:block;}
.lei li{ width:33.33%; float:left; line-height:50px; height:50px; background-color:#f5f5f5; text-align:center;}
.sj{ display:block}
}

.zd{ width:auto; display:none;}
@media screen and (max-width: 641px) {
.zd{ width:auto; display:block;}
.zd li{ width:33.33%; float:left; line-height:50px; height:50px; background-color:#f5f5f5; text-align:center;}
}