#pdf-scroll-viewer {
    height: 80vh;
    overflow-y: scroll;
}
.book-layout { display: flex; height: 100vh; }

.book-index {
    width: 380px;
    padding: 1rem;
    overflow-y: auto;
    position: sticky;
    top: 0;
    height: 100vh;
    background: white;
    z-index: 10;
}

.book-index a {
    display: block;
    margin: 4px 0;
    color: #333;
    text-decoration: none;
}
/*
        .book-index a.active {
            background: #efefef;
            font-weight: bold;
        }
*/
.book-viewer {
    flex-grow: 1;
    overflow: auto;
    background: #f5f5f5;
    text-align: center;
    position: relative;
}

canvas {
    margin: 0 auto;
    display: block;
    background: white;
    box-shadow: 0 0 8px rgba(0,0,0,0.1);
}

.navigation-buttons {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 10px;
}


@media (min-width: 768px) {
    .padding_dsk_modal{
        padding: 25px 100px 25px 100px !Important;
    }
}
@media (max-width: 768px) {

    .display_left_mob{
        display: contents !Important;
    }
    .top15_m{
        margin-top: 15px !Important;
    }
    .navigation-buttons {
        position: fixed;
        bottom: 10px;
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.95);
        padding: 10px 20px;
        box-shadow: 0 -2px 8px rgba(0,0,0,0.15);
        z-index: 100;
        justify-content: space-between;
        max-width: 480px;
        margin: 0 auto;
        border-radius: 8px 8px 0 0;
    }
    .navigation-buttons button {
        flex: 1;
        margin: 0 5px;
    }
}
.margin-25m{
    margin: -25px 0px 0px 15px !Important;
}
.background_nav_book {
    background: #625B69 !important;
}
.border_none{
    border: none !Important;
}
.back_modal{
    border-radius: 16px !Important;
    background: #FFF;
    /* Inner Shadow */
    box-shadow: 0px 4px 4px 0px rgba(0, 0, 0, 0.25) inset !Important;
}