body {
    font-family: 'Courier New', Courier, monospace;
    background-color: #000;
    color: #0f0;
    margin: 0;
    padding: 0;
}

header {
    background-color: #222;
    color: #0f0;
    text-align: center;
    padding: 1rem;
    border-bottom: 2px solid #0f0;
}

header h1 {
    font-size: 2rem;
    text-transform: uppercase;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    background-color: #111;
    border-top: 2px solid #0f0;
    border-bottom: 2px solid #0f0;
}

nav ul li {
    margin: 0 1rem;
}

nav ul li a {
    color: #0f0;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 20px;
    text-align: center;
}

section {
    margin: 20px auto;
    padding: 20px;
    max-width: 600px;
    background-color: #111;
    border: 2px solid #0f0;
    color: #0f0;
}

footer {
    background-color: #222;
    color: #0f0;
    text-align: center;
    padding: 1rem;
    border-top: 2px solid #0f0;
}