.mian{
	position: absolute;
	height: 100%;
	top: 0px;
	left: 0px;
	width:100%;
	padding: 0px;
	overflow: hidden;
}
body,html{height: 100%;overflow: hidden;}
.hide{display: none;}
.relative{position: relative;}
.pabottom30{padding-bottom:30px; }
.overflowauto{height: 100%;overflow: hidden;}
.bottommenudiv{padding-top:30px;position: relative;min-height: 100% }
.bottom_menu {
height: 50px;
background-color: rgba(255,255,255,0.4);
position: absolute; 
}
.nav_bg{padding-bottom: 100px;
}