.lower_contents_inner {
	margin: 0 15px;
}
.art-lower_contents_inner-2{
	margin-top: 2%;
	z-index: 1;
}
.art-lower_contents_inner-3{
	margin-top: -9%;
	z-index: 2;
}
.art-lower_contents_inner-4{
	margin-top: 2%;
	z-index: 3;
}
.art-lower_contents_inner-5{
	margin: 6% 15px 10%;
	z-index: 4;
}
/* btn */
.art-lower_contents_btn-1{
	position: absolute;
	bottom: 9%;
	left: 10%;
	width: 80%;
	display: block;
}

.art-lower_contents_btn-2{
	position: absolute;
	bottom: 6.5%;
	left: 10%;
	width: 80%;
	display: block;
}