body{
	margin:0;
  padding:0;
  background: url(../img/bg.jpg) no-repeat center fixed; 
  -webkit-background-size: cover; /* pour anciens Chrome et Safari */
  background-size: cover; /* version standardisée */
}

h1{
	left: 50%;
    margin: auto;
    position: absolute;
    top: 50%;
	text-align: center;
	font-family: 'Arvo', serif;
	background-color:yellow;
	margin-left:-183px;
}

@media screen and (max-width:325px){
	h1{
		font-size:1.3em;
		margin-left:-115px;
	}
}