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

header {
    color: #fff;
    padding: 1em 0;
    text-align: center;
    background: none;
    color: #000;
}

footer {
    text-align: center;
    margin-top: 20px;
    font-size: 0.9em;
}

header h1 {
    background: none;
    font-size: 3em;
    margin: 2em 0 1em 0;
    padding: 0.5em 0;
    font-weight: bold;
}

main {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

a {
    color: #000;
    text-decoration: underline;
}

a:hover {
    background: #000;
    color: #fff;
}

section {
    margin-bottom: 2em;
}

h1, h2 {
    font-family: inherit;
    font-weight: bold;
}

sup {
    font-size: 0.618em;
}