body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background-color: #f4f4f9;
    color: #333;
}

h1 {
    text-align: center;
}

form {
    text-align: center;
    margin-bottom: 20px;
}

#navigation-buttons {
    text-align: center;
    margin-bottom: 20px;
}

#navigation-buttons button {
    padding: 10px 20px;
    margin: 5px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
}

#navigation-buttons button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

#viewer-container {
    display: flex;
    justify-content: center;
    gap: 20px;
}

#pdf-container {
    width: 70%;
    text-align: center;
}

canvas {
    border: 1px solid #ccc;
    margin: auto;
    display: block;
}

#thumbnail-container {
    width: 20%;
    max-height: 600px;
    overflow-y: auto;
    background-color: #fff;
    border: 1px solid #ddd;
    padding: 10px;
    box-shadow: 0px 2px 5px rgba(0, 0, 0, 0.2);
}

#thumbnails {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.thumbnail-wrapper {
    cursor: pointer;
    padding: 5px;
    border: 1px solid #ccc;
    transition: transform 0.2s ease-in-out;
}

.thumbnail-wrapper.active {
    border: 2px solid #007bff;
    background-color: #e6f7ff;
}

.thumbnail-wrapper:hover {
    transform: scale(1.05);
    border-color: #007bff;
}

.thumbnail-wrapper canvas {
    display: block;
    margin: auto;
}
#page-info {
    text-align: center;
    margin-bottom: 20px;
    font-size: 16px;
    color: #333;
}

#page-info span {
    font-weight: bold;
}