.pdf-thumbnail-container {
    text-align: center;
    margin: 20px 0;
}
.pdf-thumbnail {
    width: 150px;
    height: 200px;
    background-size: cover;
    margin: 0 auto 10px;
    transition: transform 0.3s ease-in-out;
}
.pdf-thumbnail:hover {
    transform: rotateY(10deg) scale(1.05);
}
.pdf-title {
    font-size: 16px;
    font-weight: bold;
    margin-bottom: 10px;
}
.pdf-download-button {
    display: inline-block;
    padding: 5px 10px;
    background-color: #0073aa;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
}
.pdf-download-button:hover {
    background-color: #005177;
}
.book-style {
    width: 150px;
    height: 200px;
    background-size: cover;
    background-repeat: no-repeat;
    border: 2px solid #ccc;
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2), 0 6px 20px rgba(0, 0, 0, 0.19);
    position: relative;
    transform: perspective(800px) rotateY(-10deg);
    transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
}

.book-style::before {
    content: \"\";
    position: absolute;
    top: 0;
    left: -5px;
    width: 5px;
    height: 100%;
    background: linear-gradient(to right, #f8f8f8, #e0e0e0);
    border-radius: 5px 0 0 5px;
}

.book-style:hover {
    transform: perspective(800px) rotateY(0deg) scale(1.05);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}