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


.center {
  width: 100%;
  height: 100%;
  margin: 0 auto;
  padding-top: 4%;
}

img {
	padding: 0;
	display: block;
	max-width: 100%;
	margin: 0 auto;
}

a img:hover {
	cursor: pointer;
}