.tc{ text-align: center; }
ul,li,dd,dl,dt,img {list-style:none;}
.rel {
	position: relative;
}
#outer {
	background: #ebeff2;
}
.main_cont {
	text-align: center; 
}
.main_cont img {
	display: inline-block;
}
.img-box {
	line-height: 0;
}
/* 大于1920px */
@media screen and (min-width:1921px){
	.main_cont {
		width: 1920px; 
	}
}
/* 小于1920px */
@media screen and (min-width:1521px) and (max-width:1920px){
	.main_cont {
		width: 100%; 
	}
}
/* 小于1520px */
@media screen and (min-width:1141px) and (max-width:1520px){
	.main_cont {
		width: 100%;
	}
}
/* 小于1141px */
@media screen and (max-width:1140px){
	.main_cont {
		width: 100%;
	}
}
.btn {
	position: absolute;
	width: 14.3%!important;
	top: 54%;
	left: 23%;
}
.btn1 {
	position: absolute;
	width: 14.2%!important;
	top: 75.2%;
	left: 35.9%;
}
.btn2 {
	position: absolute;
	width: 10.6%!important;
	top: 75.2%;
	left: 53.6%;
}
footer {
	margin-top: 0;
}