html {
  background: url(nordvind-background.png) no-repeat center center fixed;
  /*   background: url(nordvind-background-winter.png) fixed; */
  /*    background-repeat: repeat;*/
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  top: 100px;
}