body {
 background-color: #EEE; 
 font-family: Helvetica, Arial, sans-serif;
}
a {
  text-decoration: none;
  color: blue;
}
h1, h2, h3 {
 margin: 0;
}
#header {
  background-color: #66ccff;
  color: white;
  padding: 10px;
  text-align: center
  
}
#content {
 padding: 10px;
}
#nav {
 width: 180px;
 float: left
}
#nav ul {
   list-style-type: none;
   padding: 0;
}
#nav .selected {
 font-weight: bold;
}
main {
  width: 600px;
  float: right;
}
footer {
 clear: both;
 padding:  10px;
 background-color: #999999;
 color: white;
 text-align: right;
}