body {
  background-image: url(radiatation-warning-tags.png);
}

h1,h2,h3 {
    
    margin: none;
}
#container {
  background-color: white;

    width: 900px;
    margin-left: auto;
    margin-right: auto;
}
#header {
   
  text-align: center;
  background-color:gold;

  color: black;
}
#content {
padding: 10px;
}

a {
    
    text-decoration: none; 
    color: darkgreen;
}
#nav {
    
    background-color: white;
    width: 200px;
    float:left;
}
#nav ul {
    padding: 5px;
    list-style-type: none;
}
#nav .selected {
    font-weight: bold;
}
#navtwo {
      background-color: gold;
color: black;


    width: 200px;
    float:left;
}
#navtwo ul {
    padding: 5px;
    list-style-type: none;
}
#navtwo .selected {
    
    font-weight: bold;
}
#main {
    width: 600px;
    float: right;
}
#footer {
    background-color: gold;

    text-align: center;
    clear: both;
}