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

header {
    background-color: #3498db;
    color: white;
    padding: 1em;
}

main {
    padding: 20px;
}

section {
    margin: 20px;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 10px;
    background-color: white;
    box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.1);
}

footer {
    background-color: #333;
    color: white;
    padding: 10px;
    margin-top: 20px;
}


@media (max-width: 768px) {
    main {
        padding: 10px;
    }
    section {
        margin: 10px;
        padding: 15px;
    }
}

@media (max-width: 480px) {
    header {
        font-size: 1.2em;
    }
    section {
        padding: 10px;
    }
    footer {
        font-size: 0.9em;
    }
}