html, body{
width:100%;
margin:0px;
padding:0px;
}

#conteneur{
width:960px;
background-color: gray;
margin:auto;
}
#haut{
height:120px;
background-color: yellow;
margin:0px;
padding:0px;
}
#milieu{
background-color:green;
margin:0px;
padding:0px;
}
#bas{
height:100px;
background-color:blue;
margin:0px;
padding:0px;
}
h1,p{
margin:0px;
}

