#gid{position: absolute;}
.case_pic{position:relative;z-index: 99999999;margin:0 auto;width: 80%;}
.case_pic>img:nth-child(1){width: 100%; margin-top: -170px;}

.case_pic>img:nth-child(2){width: 100%;margin-top: 0;}
.case_pic>img:nth-child(3){width: 100%;margin-top: 0;}
.case_pic>img:nth-child(4){width: 100%;margin-top: 0;}
.box-img{
	width: 100%;
	height: 100%;
	background: #74CAD7;

}
.box-img>.case_pic>img{width:100%;}
@media only screen and (max-width: 800px){
#gid{position: absolute;}
.case_pic{position:relative;z-index: 99999999;margin:0 auto;width: 80%;}
.case_pic>img:nth-child(1){
	width: 100%;   
 	margin-top: -90px;
 	display: block;
}

.box-img{
	width: 100%;
	height: 100%;
	background: #74CAD7;
}
}
@media only screen and (max-width: 500px){
#gid{position: absolute;}
.case_pic{position:relative;z-index: 99999999;margin:0 auto;width: 80%;}
.case_pic>img:nth-child(1){
	width: 100%;   
 	margin-top: -56px;
}

.box-img{
	width: 100%;
	height: 100%;
	background: #74CAD7;
}
}