.couverture {
    left: 0%;
    top: 0%;
    height: 100%;
    width: 100%;
    overflow: hidden;
    /*position:absolute;
        */
    text-align: center
    }
body {
    margin: 0%;
    padding: 0%;
    height: 100%;
    width: 100%
    }
.img {
    max-width: 100%;
    max-height: 100%;
    height: auto
    }
section, figure {
    display: block
    }