body:before {
         content: "";
         position: absolute;
         background: url(../Bilder/Mainboard.jpg);
         background-repeat: no-repeat;
         background-size: cover;
         background-position: center center;
         background-attachment: fixed; 
         height: 99%; width: 99%;  
         filter: blur(10px);
         z-index: -1;
        }
div.Kopf {position: absolute;
          display: flex;      
          top:0px;
          left:5px;
          height: 150px;
          width: 99%;
          border:5px solid black;
          }
.ueberschrift {
            position: absolute;
            top:0px;
            left:0px;
            height: 100px;
            width: 100%;        
            text-shadow: 1px 2px 3px navy;  
            letter-spacing: .9em;
            font-family: "Times New Roman" serif;
            padding-top: 50px;        
            text-align: center;
            font-size: 2.5em;
            font-weight: 900;
            color: blue; 
            background-color: rgb(119,136,153,0.5);
            }

nav ul {position:absolute;
    display: flex;     
    top: 152px;
         left: 250px;
         height: 30px;
         width: 65%;
         border:2px solid black;
         font-size: 25px;
         font-family: sans-serif;
         font-style: italic;
         font-weight: 200;
         color: white;
         text-decoration: none;
         list-style: none;
         display: inline-table;
         text-align: center;
         background-color: rgb(119,136,153,0.5); 
/*	     background: linear-gradient(top, #efefef 5%, #bbbbbb 20%);
         background: -moz-linear-gradient(top, #efefef 0%, #bbbbbb 20%);  '/
         box-shadow: 0px 0px 9px rgb(119,136,153,0.5);
	    /* padding: 0 20px; */
	     border-radius: 10px;  
         list-style: none;
         }

nav ul li{
	float: left;
}
nav ul li a {
	padding-right: 40px; 
    text-decoration: none;
	}
nav ul li:hover a {
/*    background: linear-gradient(top, #4f5964 0%, #5f6975 40%);*/
    visibility: visible;
    text-decoration: none;
    font-size: 25px;
    color:green;
}

nav ul li:active a{
    visibility: visible;
    font-size: 25px;
    color: red;
}
 .liste,a{
         font-size: 25px;
         font-family: sans-serif;
         font-style: italic;
         font-weight: 200;
         color: white;
         text-decoration: none;
         list-style: none;
        } 
div.fuss {position:absolute;
         top: 800px;
         left: 300px;
         padding:10px;
         height:80px;
         width:56%;
         /*border:2px dotted gray;
         background-color: rgb(119,136,153,0.5);
         color: floralwhite;
         visibility: hidden;*/
         }
div.vordergrund {position:fixed;
         top: 202px;
         left: 300px;
         padding:10px;
         height:300px;
         width:56%;
         font-size: 25px;
         font-family: sans-serif;
         font-style: italic;
         font-weight: 200;
         color: white;
        }
div.imp {
         color: white;
         overflow: scroll;
         padding:10px;
         height:500px;
         width:100%;
}