html {height: 100%;}
body {
	/*background-image: linear-gradient(to bottom right, lightgray, white, gray, silver);*/
	 background-image: linear-gradient(to bottom right, white, white, lightblue, silver); 	 
}

<!-- Universal Selektor alles in alle Browsern auf 0 -->
* {margin: 0px; padding: 0px; border: 0px;}

h1 {
 
  }
h2 {}
h3 {}
h4 {font-size: 2.0em; font-family: 'URW Palladio L'; font-weight: bold; font-style: italic; line-height: 0%; }
h5 {}
h6 {}

#kopf {
  position: absolute;
  margin-top:  10px;
  margin-left: 10px;
  width: 1600px;
  height: 90px;
  background-image: url(F_png/progit_logo.png);  
  border-radius: 4px;
  /*border: 2px solid black;	 */
  border-top: 5px solid yellow;
  border-right: 5px solid yellow ;
  box-shadow: 9px 9px #BFBFBF; 
  }
 
 nav {
  position: absolute;
  margin-top:  140px;
  margin-left: 30px;
  display: block;  
  width: 230px;
  height:650px;
  background-color: white;
  border-radius: 4px;
  border: 1px solid black;
  box-shadow: 9px 9px #A8A8A8;
  text-align: center;
  text-decoration: none;
  transition-property: all;
  transition-duration: 0.5s;
  transition-timing-function: ease; 
}
 
nav ul {
  position: absolute;
  margin-top:  70px;
}

nav li {
  list-style-type: none;  
  width: 160px; 
}

nav a {
  position: inherit;  
  display: block;	   
  text-transform: uppercase;
  text-decoration: none;
  color: black; 
  /*background-image: linear-gradient(to right, lightgray, silver, white, silver, silver, silver, lightgray, red);*/	  
  background-color: white;;
  font-size: 1.0em;
  font-family: 'URW Palladio L';
  font-weight: bold;  
  font-style: italic; 
  text-align: center;
  margin-top:5px;
  margin-left: -10px;
  padding: 5px; 
  border: 1px solid gray;
  border-radius: 4px;  
  transition-property: all;
  transition-duration: 0.5s;
  transition-timing-function: ease; 
} 

nav a:hover {
  color: darkblue;
  background-image: linear-gradient(to right, lightgray, silver, silver, silver, white, silver, lightgray );
  border: 1px solid black;	
  position: inherit;  
  transition-property: all;
  transition-duration: 1s;
  transition-timing-function: ease; 	 
} 
	 
#fuss {
  position: absolute;
  margin-top:  860px;
  width: 1600px;
  height: 30px;
  padding: 10px 0px 0px  20px;
  color: white; 
  list-style: none;
  text-decoration: none;
  background-color: #4CBCEA;
  border-top: 1px solid blue;
  border-right: 1px solid blue ;
  border-radius: 5px;  
}

#fuss a {
  position: absolute;  
  color: white;
  font-size: 0.8em;
  font-style: italic;
  
}

#fuss a:hover {
  background-color: blue;
  padding:  0px 8px 8px 8px;
}