html
{
width:100%;
height:100%;
 margin:0;
 padding:0;

background-color : white;
 -webkit-background-size: contain; /* pour anciens Chrome et Safari */
 background-size: contain; /* version standardisée */
}

div#login{

	background-image: url("../images/acceuil.jpg");
	background-repeat: no-repeat;
	background-position: center top; 
	min-height:1200px;
	background-color : white;
}