body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f3f3f3;
}

header, footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 15px;
}

nav ul {
    list-style: none;
    background: #555;
    margin: 0;
    padding: 10px;
    display: flex;
    gap: 20px;
}

nav a {
    color: white;
    text-decoration: none;
}

aside {
    background: #eee;
    padding: 15px;
    margin: 20px;
}

main {
    margin: 20px;
}

form label {
    display: inline-block;
    width: 120px;
}