body{
 
    margin: 0;
    /* background-image: url('pièces/salon.jpg'); */
}
svg {
    width: 100vw;
    height: 100vh;
}


.book {
    display: none;
}
.book.visible {
    display: block;
    position: fixed;
    aspect-ratio: 297/210;
    background: white;
    top: 2em;
    left: 2em;
    width: 40vw;
    display: flex;    
}
.book .recto, .book .verso {
    flex:1;
}
 .book img {
    width: 100%;
}