html { 
  background: url(images/bg.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  font-family: courier, sans-serif;
}
h1 {
    font-family: courier, sans-serif;
}
div.top {
    margin: auto;
    width: 60%;
}
div.content {
    margin: auto;
    width: 60%;
    border: 5px solid #73AD21;
    padding: 10px;
    background-color: #ccc; 
  
}