body{margin:0;padding:0}.worp{background:url(pc.png) no-repeat center top;height:5040px}.worp .head{margin:0 auto;width:1200px}.worp .head img{margin-top:30px}.worp .c1{margin:0 auto;width:1200px}.worp .c1 img{margin-top:-65px}.worp .c2{margin:0 auto;width:1200px}.worp .c3{margin:0 auto;width:1200px;position:relative}.worp .c3 .book{position:absolute;left:100px;top:86px;width:200px;height:277px;border:none}.worp .c3 .btn{position:absolute;border:none;left:74px;top:373px;width:222px;height:62px}