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

header {
background: #222;
color: white;
padding: 15px;
}

nav a {
color: white;
margin-right: 15px;
text-decoration: none;
}

main {
padding: 20px;
}

article {
background: white;
padding: 15px;
margin-bottom: 15px;
border-radius: 5px;
}

footer {
text-align: center;
padding: 10px;
background: #ddd;
}