body {
    font-family: Arial, sans-serif;
    color: #fff;
    background-color: #000;
    margin: 0;
    padding: 0;
}
header, footer {
    background-color: #111;
    padding: 1em;
    text-align: center;
}
nav ul {
    list-style-type: none;
    padding: 0;
}
nav li {
    display: inline;
    margin: 0 10px;
}
nav a {
    text-decoration: none;
    color: white;
    border: 2px solid crimson;
    padding: 4px 8px;
    font-size: 1.1em;
}
.logo {
    width: 100px;
    margin: 10px auto;
    display: block;
}
main {
    padding: 2em;
    max-width: 900px;
    margin: auto;
}