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

#dessus{
height:5px;
width:1000px;
background-color: #888;
}

#dessous{
height:3px;
width:1000px;
background-color: #222;
}

#conteneur_fond{
width:100%;
height:100%;
position:absolute;
top:0px;
left:0px;
z-index:-1;
background:#AAA url("h_coloree.jpg") no-repeat 50% 50%;
background-size:cover;

}

h1{
width:500px;
font-family:Arial;
font-size:24px;
background-color: rgba(0,0,255,0.5);
color:yellow;
}

h2{
width:350px;
font-family:Arial;
font-size:20px;
background-color: rgba(0,0,0,0.5);
color:white;
}

p{
font-family:Calibri;
width:100px;
font-size:16px;
background-color: rgba(255,255,255,0.8);
color:gray;
}