#header{}

#enter {
	margin-right: auto;
	margin-left: auto;
	width: 750px;
	position: relative;
	margin-bottom:140px;
}
#contents {
}
#enter .btn_enter {
	position: absolute;
	top: 193px;
	right: 163px;
}
#enter .backnumer {
	position: absolute;
	left: 30px;
	bottom: -40px;
}

.enter #header{
margin:0px;
}