body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #000;
    color: white;
}
header {
    background: #0f0f23;
    text-align: center;
    padding: 20px;
}
.logo {
    max-width: 120px;
}
nav a {
    margin: 0 10px;
    color: #00bcd4;
    text-decoration: none;
}
nav a:hover {
    text-decoration: underline;
}
.button {
    display: inline-block;
    padding: 10px 20px;
    background: #00bcd4;
    color: #000;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 20px;
}
footer {
    text-align: center;
    padding: 10px;
    background: #111;
    color: #888;
}