body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    padding-top : 110px;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background-color: rgb(74, 201, 226);
    color: white;
    text-align: center;
    padding: 0.5rem;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

main {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.1);
}

h2 {
    border-bottom: 2px solid rgb(74, 201, 226);
    padding-bottom: 5px;
}

form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

input, button {
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ccc;
    font-size: 1rem;
}

button {
    background-color: rgb(74, 201, 226);
    color: white;
    cursor: pointer;
    border: none;
    transition: background 0.3s;
}

button:hover {
    background-color: rgb(29, 109, 125);
}

.book-item {
    background: #ffffff;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0px 2px 5px rgba(0, 0, 0, 0.1);
    margin-bottom: 10px;
}

.book-item h3 {
    margin: 0;
    color: rgb(74, 201, 226);
}

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

@media (max-width: 768px) {
    main {
        width: 90%;
        padding: 15px;
    }

    header {
        padding: 0.8rem;
    }

    h2 {
        font-size: 1.2rem;
    }

    input, button {
        font-size: 0.9rem;
        padding: 8px;
    }
}

@media (max-width: 480px) {
    main {
        width: 95%;
        padding: 10px;
    }

    header {
        font-size: 1rem;
    }

    h2 {
        font-size: 1rem;
    }

    input, button {
        font-size: 0.85rem;
        padding: 7px;
    }
}