body {overflow-y:hidden;overflow-x:hidden;}
/******************网页主体部分css******************/
.header_bg{position: fixed; z-index: 99; top: 0; left:0;}
.wrapper_bg{width:100%; background:#111b35 url(../images/about_bg.png); _background:#111b35;}
.wrapper{position: relative; z-index: 2;}

.nag{position: fixed; z-index:99; right:30px;background:url(../images/nag.png) no-repeat;width:38px; height:213px;}
.nag .ac{width:14px;height:14px;margin:14px 0px 28px 12px;cursor: pointer;}
.nag .ac.active b{background:url(../images/bw.png) no-repeat;width:38px;height:40px; display:inline-block; margin: -14px 0px 0px -12px;}
.back{height:1200px; position: relative; z-index: 10; top: 350px; margin: 0 auto;}
.divtop{width: 38px;height: 60px;position: fixed; bottom: 10px;left: 50%;margin-left: -19px;z-index: 20;}
.btntop{cursor:pointer;z-index:5;margin-top:30px;width:38px;height:19px;}

/*第一个场景css*/
.a1{width:100%;background:#111b35 url(../images/about_bg.png); _background:#111b35; position: relative;}
.a1_one{width:1200px; height:462px;position: absolute; margin-top: 230px; margin-left: auto; margin-right: auto;}
.a_0{position: absolute; left:50%; top:50px; width: 120px; height: 34px;margin-left:84px;}
.one_img{width:300px; height: 200px; border-bottom:1px #233460 solid;}
.years{width: 340px;}
.years em{width:340px; height: 30px; line-height: 30px; font-size:24px; padding: 10px 0 5px; display: block;}
.years span{width:340px; height: 20px; line-height: 20px; font-size:17px; display: block;}
.years b{width:340px; height: 32px; padding: 5px 0 30px; font-size: 30px; display: block;}
.years p{color: #7892cd; line-height: 24px; font-size: 13px;}

/*第二个场景css*/
.a2{width:100%;background:#1e4153 url(../images/about_bg.png); _background:#1e4153; position: relative;z-index:2;}
.n3{width:1200px;height:520px; position: absolute;top:300px;left:45%;margin-left:-500px}
.years_2{width: 400px;}
.years_2 em{width:400px; height: 50px; line-height: 50px; font-size:46px; padding: 10px 0; display: block; color: #ffcc00;}
.years_2 span{width:400px; height: 40px; line-height: 40px; font-size:35px; display: block; color: #deb203; padding: 10px 0 20px;}
.years_2 p{line-height: 24px; color: #fff; font-size: 13px;}

/*第三个场景css*/
.a3{width:100%;background:#c22e41 url(../images/years_2.jpg); position: relative;z-index:3;}
.n4{width:1200px;height:500px; position: absolute; top:300px;left:45%;margin-left:-500px;}
.years_3{width: 400px;}
.years_3 em{width:400px; height: 50px; line-height: 50px; font-size:46px; padding: 10px 0; display: block;}
.years_3 span{width:400px; height: 40px; line-height: 40px; font-size:35px; display: block; padding: 10px 0 20px;}
.years_3 p{ line-height: 24px; font-size: 13px;}

/*第四个场景css*/
.a4{width:100%;background:#4d4948 url(../images/years_3.jpg); position: relative;z-index:4;}
.n5{width:1200px;height:500px; position: absolute; top:350px;left:45%;margin-left:-500px;}
.years_4{width: 400px;}
.years_4 .name{width:400px; height: 30px; line-height: 30px; font-size:20px; display: block;}
.years_4 .thank{width:400px; height: 40px; line-height: 40px; font-size:40px; padding: 10px 0; display: block; color: #cd0202;}
.years_4 em{width:400px; height: 22px; line-height: 22px; font-size:20px; padding: 10px 0 5px; display: block; border-top: 1px #7b7877 solid;}
.years_4 span{width:400px; height: 20px; line-height: 20px; font-size:14px; display: block;}
.years_4 p{ line-height: 24px; font-size: 13px;}
.years_4 b{width:400px; height: 32px; padding: 5px 0 30px; font-size: 30px; display: block;}
.years_4 .message{width:100px; height: 30px; line-height: 30px; background: #1e7ecf; display: block; font-size: 14px; font-weight: bold; margin-top: 10px;}
.years_4 .message a{display: block; color: #ff0;}
.years_4 .message a:hover{display: block; color: #fff; background:#f00;}