body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    background-color: #f4f4f9;
    color: #333;
}

header {
    background: #4CAF50;
    color: #fff;
    padding: 20px 0;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

main {
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

section {
    margin-bottom: 40px;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

footer {
    background: #4CAF50;
    color: #fff;
    text-align: center;
    padding: 10px 0;
    position: fixed;
    width: 100%;
    bottom: 0;
    box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.1);
}

@media (max-width: 600px) {
    header, footer {
        padding: 15px 0;
    }

    main {
        padding: 10px;
    }

    section {
        padding: 15px;
    }
}