body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f9f9f9;
    color: #222;
}

header {
    background: #20232a;
    color: #fff;
    padding: 1em 0;
    text-align: center;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 1em 0 0 0;
    display: flex;
    justify-content: center;
    gap: 2em;
}

nav ul li {
    display: inline;
}

nav ul li a {
    color: #61dafb;
    text-decoration: none;
}

nav ul li a:hover {
    text-decoration: underline;
}

main {
    max-width: 800px;
    margin: 2em auto;
    background: #fff;
    padding: 2em;
    border-radius: 8px;
    box-shadow: 0 0 8px rgba(0,0,0,0.07);
}

footer {
    text-align: center;
    padding: 1em 0;
    background: #20232a;
    color: #fff;
    position: fixed;
    width: 100%;
    bottom: 0;
}