body {
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 0;
}
header {
    background: #222;
    color: #fff;
    padding: 20px 0;
    text-align: center;
}
nav ul {
    list-style: none;
    padding: 0;
}
nav ul li {
    display: inline;
    margin: 0 15px;
}
nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}
nav ul li a:hover {
    color: #ff9800;
}
main {
    max-width: 800px;
    margin: 30px auto;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    text-align: center;
}
footer {
    background: #222;
    color: #fff;
    text-align: center;
    padding: 10px 0;
    width: 100%;
    margin-top: 40px;
}

body {
    min-height: 100vh;
    padding-bottom: 60px;
}