body {
    font-family: sans-serif;
	line-height: 2;
    text-align : center;
    color: #555;
    background-color: #fff;
}

#conteneur {
    max-width : 980px;
    margin:auto;
}

header, main, h1, nav, h2, h3, section, article, p, footer, #license {
    margin: 10px;
    background-color: rgba(0,0,0,0.1);
    border: solid rgba(0,0,0,0.2);
}