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1600px){.case_left{left:-70px}.case_right{right:-70px}.structure_btn{position:absolute;top:140px;z-index:3;display:block;cursor:pointer;width:24px;height:46px;opacity:0.5}.structure_btn:hover{opacity:1}.left_icon{left:-40px;background:url("../images/index/structure_left.png") no-repeat;background-size:100% 100%;-moz-background-size:100% 100%;-o-background-size:100% 100%;-ms-background-size:100% 100%;-webkit-background-size:100% 100%}.right_icon{right:-40px;background:url("../images/index/structure_right.png") no-repeat;background-size:100% 100%;-moz-background-size:100% 100%;-o-background-size:100% 100%;-ms-background-size:100% 100%;-webkit-background-size:100% 100%}}