html { 
  margin:0;
  padding:0;
  background: url('background2.jpg') no-repeat center fixed;
  -webkit-background-size: cover; /* pour anciens Chrome et Safari */
  background-size: cover; /* version standardisée */ 
}

h1 {
    left: 0;
    line-height: 200px;
    margin-top: -100px;
    position: absolute;
    text-align: center;
    top: 50%;
    width: 100%;
    font-size: 2.5em;
	font-family: Arial, Helvetica, sans-serif;
	color: White;
background: white;
color: black;
mix-blend-mode: screen;
}