body {
	background-color: grey;
	color: black;
	font-size: 20px;
	font-family: sans-serif;
}
h1 {
     text-align: center;
     background-color: black;
     color: white;
     padding: 20px;
	 background-image: url("images/retour-vers-le-futur-750x375.jpg");
	 background-size: contain;
 } 
 .style1  {
	background-color: lightpink;
	padding: 20px;
	margin: 20px;
}