body {
font-family: Arial;
margin: 0;
background: #f4f4f4;
}

header {
background: #111;
color: white;
padding: 20px;
text-align: center;
}

nav {
background: #333;
padding: 10px;
text-align: center;
}

nav a {
color: white;
margin: 10px;
text-decoration: none;
}

main {
background: white;
padding: 20px;
max-width: 900px;
margin: auto;
}

footer {
background: #111;
color: white;
text-align: center;
padding: 20px;
}