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 {
    display: flex;
    justify-content: center;
    background-color: #333;
}

nav a {
    color: white;
    padding: 14px 20px;
    text-decoration: none;
    text-align: center;
}

nav a:hover {
    background-color: #ddd;
    color: black;
}

.container {
    padding: 2em;
}

.section {
    background-color: white;
    margin: 1em 0;
    padding: 2em;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

footer {
    text-align: center;
    padding: 1em 0;
    background-color: #333;
    color: white;
    position: fixed;
    width: 100%;
    bottom: 0;
}