body {
  background-size: 100% auto;
  -moz-background-size: 100% auto;
  -o-background-size: 100% auto;
  -webkit-background-size: 100% auto;
  -khtml-background-size: 100% auto;
  background-attachment: fixed;
  background-position: 0 0;
  background-repeat: no-repeat;
}