#space, .stars {
  overflow: hidden;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  display: inline;
}

.stars {
  background-image: 
    radial-gradient(2px 2px at 20px 30px, blue, rgba(0,0,0,0)),
    radial-gradient(2px 2px at 40px 70px, blue, rgba(0,0,0,0)),
    radial-gradient(2px 2px at 50px 160px, blue, rgba(0,0,0,0)),
    radial-gradient(2px 2px at 90px 40px, blue, rgba(0,0,0,0)),
    radial-gradient(2px 2px at 130px 80px, blue, rgba(0,0,0,0)),
    radial-gradient(2px 2px at 160px 120px, blue, rgba(0,0,0,0));
  background-repeat: repeat;
  background-size: 200px 200px;
}

@media only screen and (min-width: 680px) {
  #space, .stars {
    display: none;
  }
}