body { border:10px solid white;
    min-width: 100vw;
    min-height:100vh;
    background-image:url('/img/u/l/1_1/pommes-roses-sur-un-arbre.jpg');
    background-position: 0 0;
    background-size:cover;
    background-attachment: fixed;
    background-color:#FFF;
    font-family: "Roboto","Helvetica Neue","Noto Sans", sans-serif;
}
#mainSection {
    min-height:80vh;
    margin: 0;
    padding: 0
}