header  {
  margin: 0px;
  margin-left: 20px;
  margin-right: 20px;
  border: 2px solid black;
  background: orange;
}

header p#links {
  margin: 5px 0px 0px 10px; 
  font-size: 42px;
  font-family: Arial;
}

header p#rechts {
  margin: 0px 5px 5px 0px; 
  font-size: 12px;
  text-align: right;
  vertical-align: middle;
  font-family: Arial;
}

nav {
  margin: 50px 0px 0px 20px;
  float:left;
}


nav li {
  display: block;
}


nav a:link , 
nav a:visited {
  display: inline-block;
  width: 100px;
  padding: 5px;
  background: #C0C0C0;
  text-decoration: none;
  color: black;
  border: 2px solid black;
}

nav a:hover {
  background-color: orange;
  text-decoration: underline;
}

nav li a#aktiv {
  background: #e5e5e5;
  border-bottom: 2px solid #bbd7f6;
}

main {
  margin-top: 50px;
  margin-left: 200px;
  margin-right: 200px;
  margin-bottom: 50px;
  padding: 10px;
  border-left: 2px solid black;
  border-right: 2px solid black;
  border-bottom: 2px solid black;
  border-top: 2px solid black;
  background: #e5e5e5;
}

main  p#gross {
  font-size: 42px;
  font-family: Arial;
  text-align: center;
}

main h1 {
  font-size: 32px;
}

footer  {
  margin: 20px;  
}

footer li {
  display: inline;
}

footer img {
  border: 2px solid black;
}