.pdf-flipbook-container {
    position: relative;
    margin: 20px auto;
    border: 1px solid #ddd;
    border-radius: 5px;
    overflow: hidden;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

.loading-indicator {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.7);
    color: white;
    font-size: 1.2em;
    z-index: 1000;
}

/* Customize flipbook controls */
.flipbook-controls {
    background: rgba(0,0,0,0.7) !important;
    padding: 10px !important;
}

.flipbook-button {
    background: #4CAF50 !important;
    border-radius