body {
    background-color: #121212;
    color: #f0f0f0;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
header, footer {
    background-color: #1f1f1f;
    padding: 1em;
    text-align: center;
}
nav a {
    color: #f0f0f0;
    margin: 0 1em;
    text-decoration: none;
}
main {
    padding: 2em;
    text-align: center;
}
a {
    color: #64b5f6;
}