body {
    font-family: Arial;
    padding: 20px;
    background: #f3f3f3;
}

#book-container {
    margin-top: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}

.book-card {
    padding: 15px;
    background: white;
    border-radius: 10px;
    border: 1px solid #ddd;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn {
    padding: 8px 14px;
    margin-top: 10px;
    border: none;
    background: #4c8bf5;
    color: white;
    cursor: pointer;
    border-radius: 6px;
}

.book-card button {
    margin-right: 5px;
}

dialog {
    padding: 20px;
    border: none;
    border-radius: 10px;
}

dialog::backdrop {
    background: rgba(0,0,0,0.4);
}