#pdfcontainer {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 100%;
    text-align: center;
}

h1 {
    color: #3498db;
    margin-bottom: 20px;
}

.upload-btn,
.generate-btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 5px;
    margin-bottom: 10px;
    cursor: pointer;
    text-decoration: none;
    color: #fff;
}

.upload-btn {
    background-color: #3498db;
}

.generate-btn {
    background-color: #2ecc71;
    margin-top: 20px;
}

#imageUpload {
    display: none;
}

.thumbnail-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.thumbnail {
    display: inline-block;
    margin: 5px;
    cursor: pointer;
    position: relative;
    border: 2px solid #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
    transition: border-color 0.3s ease-in-out;
}

.thumbnail img {
    max-width: 100%;
    height: auto;
    border-radius: 5px;
    transition: transform 0.3s ease-in-out;
}

.thumbnail.selected {
    border-color: #2ecc71;
}

.thumbnail.selected img {
    transform: scale(1.1);
}

.watermark {
    font-size: 12px;
    color: rgba(0, 0, 0, 0.5);
}

#loadingSpinner {
    display: none;
}