#senkrecht      { background-color: #06c; visibility: visible; position: absolute; z-index: 2; top: 100px; left: 140px; width: 1px; height: 500px; clip: rect(0, 1px, 500px, 0); }
#waagrecht     	{ background-color: #06c; visibility: visible; position: absolute; z-index: 2; top: 100px; left: 140px; width: 620px; height: 1px; clip: rect(0, 620px, 1px, 0);  }
#backtop 		{ background-color: #06c; visibility: visible; position: absolute; z-index: 2; top: 0; left: 0; width: 910px; height: 10px; clip: rect(0, 910px, 10px, 0); }
#backleft 		{ background-color: #06c; visibility: visible; position: absolute; z-index: 2; top: 0; left: 0; width: 10px; height: 610px; clip: rect(0, 10px, 610px, 0); }
#backlehrer  				{
	background-color: #e8e8e8;
	visibility: visible;
	position: absolute;
	z-index: 1;
	top: 10px;
	left: 10px;
	width: 900px;
	height: 693px
}
#inhaltlehrer  			{
	visibility: visible;
	position: absolute;
	z-index: 2;
	top: 125px;
	left: 160px;
	width: 740px;
	height: 519px
}