html {
  height: 100%;
}

body {
  background: lightblue;
  font-family: Helvetica, Verdana, "Sans serif";
  color: white;
  background-image: url("/assets/background.jpg");
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-position: center; 
  background-size: 100%;
  height: 99%;
}