html
{
background-color:rgb(155,155,155);
}

body
{
margin:1em;
padding:2em;
border:white 1px solid;
}

h1
{
text-align:center;
}

#header img
{
margin-top:1em;
margin-left:15%;
margin-bottom:1em;
}

#conteneur
{
margin-top:1em;
margin-left:2.5%;
margin-bottom:1em;
width:95%;
border:white 1px solid;
background-color:rgb(185,185,185);
}

#conteneur p
{
text-align:center;
border-top:white solid 1px;
margin:0.2em;
}