#header{}

#enter {
	margin-right: auto;
	margin-left: auto;
	width: 500px;
	position: relative;
	margin-bottom:140px;
}
#contents {
}
#enter .btn_enter {
	position: absolute;
	top: 121px;
	right: 34px;
}
#enter .backnumer {
	position: absolute;
	left: 30px;
	bottom: -40px;
}