/* Définitions de base */
* {
	border: 0;
	margin: 0;
	padding: 0;
}
body {
	background-color: #fff; color: #1a6584;
	text-align: center;
}
#bg {

}
#bg img {
	min-height: 100%;
	min-width: 800px;

	width: auto;
	height: 100%;
	
	position: fixed;
	top: 0;
	left: 0;
}
@media screen and (max-width: 800px) { /* Specific to this particular image */
  img.bg {
    left: 50%;
    margin-left: -512px;   /* 50% */
  }
}
/* ##  base  ## */