body{
    margin:0;
    padding:0;
}
ul,li{list-style:none;}
.header1{
    position: fixed;
    top:0px;
    width:100%;
    height:90px;
    z-index: 9999999;
    background-color:rgba(0,0,0,.4);
}

.header2{
	width:1170px;
  	margin:0 auto;

}
.logo{
    display:inline-block;
    width:200px;
    height:60px;
    margin: 16px 0px 16px 10px;
}
.logo img{
    display: block;
    width:200px;
    height:60px;
}
.nav{
    display:inline-block;
    height:90px;
    margin-left:200px ;
}
.nav>ul>li{
    float:left;
    height:90px;
    padding:0 20px 0 20px;
    line-height:90px;
}
.nav>ul>li>a{
    color:white;
    font-weight:bolder;
}
.nav>ul>li:nth-child(1)>a{
    color:rgb(45,99,135);
}
.nav>ul>li:hover>a{
    color:rgb(45,99,135);
}
.nav>ul>li:nth-child(2):hover .prod, .nav>ul>li:nth-child(3):hover .Tuse{
    display:block;
}
.nav>ul>li:nth-child(2){
    position:relative;
}
.nav>ul>li:nth-child(2) .prod,.nav>ul>li:nth-child(3) .Tuse{
    display:none;
    position:absolute;
    top: 89px;
    left:15px;
    z-index:9999;
}
.main li{
    position:relative;
}
.main>li:nth-child(2):after,.main>li:nth-child(3):after{
    position:absolute;
    top: 37px;
    right:0;
    display:block;
    content:'';
    width:15px;
    height:15px;
    background:url("jiantou.png") no-repeat;
    background-size:100% 100%;
}
.prod>li,.Tuse>li{
    position:relative;
    width:250px;
    height:40px;
    color:black;
    line-height: 40px;
    font-size: 14px;
    background: #fff;
    text-align: left;
    text-indent: 2em;
    box-shadow:0 0 3px #eee;
    border-bottom:1px solid #eee ;
}
.prod>li>a,.Tuse>li>a,.threeul>li>a{
    color:black;
}
.prod>li>ul{
    display:none;
    position:absolute;
    left: 251px;
    top:0px;
}
.prod>li:hover >ul{
    display:block;
}
.prod>li:nth-child(1)>ul{
    top:-3px;
}
.prod>li:nth-child(1)::after,.prod>li:nth-child(3)::after{
    position:absolute;
    top:12px;
    right:12px;
    content: '';
    display:block;
    width:15px;
    height:15px;
    background:url("right.png") no-repeat;
    background-size:100% 100%;
}
.prod>li,.prod>li>ul>li{
    width:250px;
    height:40px;
    line-height:40px;
    background:rgb(255,255,255);
    box-shadow:0 0 3px #eee;
}
.prod>li:nth-child(1),.Tuse>li:nth-child(1),.prod>li>ul>li:nth-child(1){
    border-top:3px solid rgb(40,139,208);
}
.prod>ul li:hover,.use>li:hover,.prod>li:hover,.Tuse>li:hover,.prod>li>ul>li:hover{
    background:rgb(236,240,241);
}