html { 
  background: url(_images/nightskystars.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

body {
	padding: 15% 0 0 0;
}

#world {
	width: 318px;
	height: 318px;
	margin: 0 auto;
}

#stars img {
	display: none;
}