.a1  {width: 100%;} 
.a1a {width: 100%; background-color: #E4E7E8;}
.a1b{width: 100%; background-color: black;}
.a10 {width: 1200px; height: 120px; margin: 0 auto; line-height: 120px;} .a10 img{height: 80px;}
.a10b{width: 130px; height: 120px;}
.a10c{width: 400px; height: 120px;}
.a10d{width: 270px; height: 120px; line-height: 120px; font-size: 20px;}

.a20 {width: 1200px; height: 50px; margin: 0 auto; }
.a21 {width: 150px; height: 50px; line-height: 50px; text-align: center; font-size: large; color: #697C8A;}
.a31 {width: 1900px; height: 730px; margin: 0 auto;}
.a41 {width: 1200px; height: 150px; margin: 0 auto; line-height: 150px; font-size: 30px; text-align: center;}
.a50 {width: 1200px; height: 470px; margin: 30px auto;} 
.a51 {width: 300px; height: 470px;}
.a51a{width: 300px; height: 420px;}
.a51b{width: 300px; height: 50px;}
.a60 {width: 1900px; height: 760px; margin: 30px auto;} .a60 img{height:760px;}

.a61 {width: 940px; height: 760px;}
.a61a{width: 940px; height: 650px; background-color: gainsboro;}
.a61b{width: 940px; height: 110px; background-color: gainsboro;}
 
.a62 {width: 5px; height: 760px;}
.a63 {width: 470px; height: 760px;}
.a64 {width: 480px; height: 760px;}
.a641 {width: 480px; height: 360px;} .a641 img{width: 480px; height: 300px;}
.a642 {width: 480px; height: 400px; } .a642 img{width: 480px; height: 400px;}
.a70 {width: 1200px; height: 220px; margin: 30px auto;}
.a71 {width: 385px; height: 220px; background-color: #D6D4D4;}
.a72 {width: 22.5px; height: 220px;}
.a8  {width: 100%; height: 600px; background-color: #F2F3F4;}
.a8a {width: 600px; height: 250px; padding-top: 10px; line-height: 50px;}
.a8b {width: 560px; height: 250px; padding-top: 10px;}
.a9  {width: 1200px; height: 50px; margin:0 auto;  line-height: 50px;} .a9 span{display: inline-block; width:150px; color: #617884; font-size: 16px;}
.b10 {width: 1200px; height: 250px; margin: 0 auto;}

.b11 {width: 1200px; height: 80px; line-height: 20px; margin: 0 auto; color: white;}
.about1{width: 1200px;  margin: 10px auto; }
.about1 h1{color: #617886; height: 50px; line-height: 80px;}
.about1 h2{color: #617886; height: 50px; line-height: 80px;}
.about1 p{color: #617886; line-height: 30px; font-size:20px; padding-top: 20px; text-indent: 2em;}
.about1 img{margin: 50px;}

.pro1{width: 1200px; margin: 0 auto; text-align: center;} .pro1 h1{text-align: center; padding-top:30px ;} .pro1 img{margin: 20px auto;}
.pro1 p{text-align: left; font-size: 20px; margin: 20px auto;}