#flipbook {
    width: 660px;
    height: 550px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
    background: #fff;
}
.spread {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    height: 100%;
}
.page {
    width: 48%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}
.page img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}
.page:hover {
    opacity: 0.9;
}
.nav-buttons {
    width: 660px;
    margin: 10px auto;
    display: flex;
    justify-content: space-between;
}
.nav-buttons button {
    padding: 8px 20px;
    cursor: pointer;
    font-size: 14px;
}