body {
 background: url(samrefolkbackground.png) no-repeat center center fixed; 
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
.center {
  display: block;
  margin-top: 20%;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}
}