.nav_oben 
{
	box-sizing: border-box;
	float: left;
	width: 880px;
	background: #dddddd;
	position: relative;
	z-index: 100;
	margin-bottom: 10px;
}

.nav_oben ul
{
	margin: 0;
	padding: 0;
}

.nav_oben h2
{
	margin: 10px;
	margin-top: 5px;
	margin-bottom: 0px;
}

.nav_oben a
{
	display: block;
	text-decoration: none;
}

.nav_oben ul li
{
	position:relative;
	float: left;
	list-style: none;
}

.nav_oben ul li:hover {
	background: #cccccc;
}

.nav_oben ul li a
{
	padding: 20px;
	padding-top: 10px;
	margin: 0px;
}

.nav_oben ul ul
{
	position: absolute;
	top: -9999px;
	left: -9999px;
	background: #aaaaaa;
	box-shadow: 5px 5px 10px rgba(0,0,0, 0.6);
}
.nav_oben ul ul li 
{
	float: none;
	width: 200px;
}

.nav_oben ul ul li a 
{
	padding: 10px 20px;
}

.nav_oben ul li:hover > ul 
{
	top: 100%;
	left: 0;
}

.nav_oben + div
{
	clear: both;
}