body {
    font-family: Arial, sans-serif;
    margin: 0;
    background-color: #f4f4f4;
}
header {
    background-color: #2c3e50;
    color: white;
    padding: 10px 0;
    text-align: center;
}
header h1 {
    margin: 0;
}
header a {
    text-decoration: none;
    color: #fffefe;
}
.container {
    width: 90%;
    margin: 0 auto;
    padding: 20px;
}
.search-filter {
    display: flex;
    flex-direction: column;
    margin-bottom: 20px;
}
.search-filter input[type="text"],
.search-filter select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    margin-bottom: 10px;
}
.book-list {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}
.book-item {
    flex: 1 1 30%;
    background-color: #fff;
    padding: 15px;
    border: 1px solid #ccc;
    border-radius: 5px;
    text-align: center;
}
.book-item h3 {
    margin: 10px 0;
    color: #333;
}
.book-item button {
    padding: 10px 15px;
    background-color: #2980b9;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
.book-item button:hover {
    background-color: #216999;
}
/* Media Queries for Responsive Design */
@media (max-width: 768px) {
    .search-filter {
        flex-direction: column;
    }
    .search-filter input[type="text"] {
        width: 100%;
        margin-bottom: 10px;
    }
    .search-filter select {
        width: 100%;
    }
    .book-item {
        flex: 1 1 100%;
    }
}
@media (max-width: 480px) {
    header h1 {
        font-size: 1.5em;
    }
    .book-item {
        padding: 10px;
    }
}