* {
				margin: 0px;
				padding: 0px;
				
			}
			
			/*导航栏*/
			.nav {
				width: 100%;
				height: 80px;
				margin: auto;
				cursor: pointer;
			}
			
			.nav-center {
				width: 100%;
				height: 80px;
				position: fixed;/*置顶*/
				background-color: #515453;
				background:rgba(0,0,0,0.5);
				z-index: 99;
			}
			
			.navbar {
				margin: auto;
				width: 1200px;
				height: 80px;
			}
			
			.navbar img {
				margin-top: 20px;
				vertical-align: middle;				
			}
			
			.ul {
				color: white;
				line-height: 80px;
				text-align: center;
				float: right;
			}
			
			.ul li {
				width: 140px;
				height: 77px;
				font-size: 18px;
				list-style-type: none;
				display: inline-block;
				position: relative;

			}
			.ul li:after{
                content: "";
                width: 0;
                height: 3px;
                background: #2ECE2E;
                position: absolute;
                top: 100%;
                left: 50%;
                transition: all 0.5s;
            } 
            .ul li:hover:after{
                left: 0%;
                width: 100%;
            }
			
			.ul a {
				text-decoration: none;
				color: white;
				display: block;
				width: 140px;
				height: 80px;
			}
			.ul a:hover{
				opacity: 0.8;
			}
			.div1{
				width: 140px;
				height: 144px;
				font-size: 18px;
				display: none;
				position: absolute;
				z-index: 1000;
				background: #2ECE2E;
				color: white;
			}
			.div1 a{
				display: block;
				width: 140px;
				height: 48px;
			}
			.div1 a:hover{
				background: black;
				background: rgba(0, 0, 0, 0.1);
				opacity: 0.5;
			}
			.div1 div{
				width: 140px;
				height: 48px;
				line-height: 48px;
			}
			.div2{
				width: 140px;
				height: 48px;
				font-size: 18px;
				display: none;
				position: absolute;
				z-index: 1000;
				background: #515453;
				color: white;
			}
			.div2 a{
				display: block;
				width: 140px;
				height: 48px;
			}
			.div2 a:hover{
				background: black;
				background: rgba(0, 0, 0, 0.1);
				opacity: 0.5;
			}
			.div2 div{
				width: 140px;
				height: 48px;
				line-height: 48px;
			}
			.div3{
				width: 140px;
				height: 48px;
				font-size: 18px;
				display: none;
				position: absolute;
				z-index: 1000;
				background: #515453;
				color: white;
				background: rgba(0, 0, 0, 0.5);
			}
			.div3 a{
				display: block;
				width: 140px;
				height: 48px;
			}
			.div3 a:hover{
				background: #515453;
				opacity: 0.5;
			}
			.div3 div{
				width: 140px;
				height: 48px;
				line-height: 48px;
			}