.yh_nav {
	position: fixed;
	left: 0px;
	right: 0px;
	bottom: 0px;
	z-index: 99;
}
.yh_nav .c{
	position: absolute;
	width:100%;
	height:100%;
}
.yh_nav .c a{
	width:25%;
	height:100%;
}
.bot {
	background-color: black;
	font-size: 11px;
	color: #fff;
	padding: 20px 0;
}
.bot a{
	color: #fff;
}