body {
  background-color: gray;
  color: white;
  font-family: Helvetica;
  font-size:1em;
  
}


#site_header{
  position:float;
  color:blue;
  font-family:Helvetica;
  margin:auto;
  display:block;
}

li{
  border: 2px solid black;
  background-color:white;
  font-weight:bold;
  display:inline;
  font-size:1.5em;
  padding:3px;
  margin:auto;
}

li a{
  text-decoration:none;
}

li a:hover{
  color:red;
  font-weight:bold;
  text-decoration:none;
}

.right{
  float:right;
  width: 99%;
  position:relative;
  padding-left:15px;
  padding-right:10px;
}