body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
}

header {
    background: #1e88e5;
    color: white;
    padding: 15px;
    text-align: center;
}

nav a {
    color: white;
    margin: 0 15px;
    text-decoration: none;
    font-weight: bold;
}

.hero {
    padding: 50px;
    text-align: center;
    background: white;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: #1e88e5;
    color: white;
    text-decoration: none;
    border-radius: 5px;
}

.book-list {
    display: flex;
    gap: 20px;
    padding: 20px;
}

.book-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    width: 30%;
    box-shadow: 0px 0px 5px rgba(0,0,0,0.1);
}

footer {
    text-align: center;
    padding: 10px;
    background: #ddd;
    margin-top: 20px;
}