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

header {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    padding: 1em 0;
}

nav ul {
    list-style-type: none;
    padding: 0;
    text-align: center;
    background-color: #333;
    margin: 0;
}

nav ul li {
    display: inline;
}

nav ul li a {
    text-decoration: none;
    color: white;
    padding: 14px 20px;
    display: inline-block;
}

nav ul li a:hover {
    background-color: #111;
}

main {
    padding: 20px;
}

section {
    margin: 20px 0;
    padding: 20px;
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

footer {
    text-align: center;
    padding: 10px 0;
    background-color: #333;
    color: white;
    position: fixed;
    width: 100%;
    bottom: 0;
}