html {
  background:url('greenhills.jpg') no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}
/*placeholder, will fill with logo*/
header{
  text-align: center;
  font-size: 50px; 
}

article{
  text-align:center;
}