html, body{
width:100%;
height:100%;
}

#conteneur_fond{
width:100%;
height:100%;
position:absolute;
top:0px;
left:0px;
z-index:-1;
background:#AAA url("h_mouette.jpg") no-repeat 0% 0%;
background-size:cover;
}

#bloc1{
width:100px;
height:150px;
background-color:blue;
}

#bloc2{
width:200px;
height:100px;
background-color:yellow;
}

h1{
color:red;
}

h2{
background-color:gray;
}

p{
font-size:24px;
}