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

header {
background-color: yellow;
color: pink;
text-align: center;
padding: 20px;
}

nav ul {
list-style: none;
padding: 0;
background-color: red;
text-align: center;
}

nav ul li {
display: inline;
margin-right: 20px;
}

nav ul li a {
text-decoration: none;
color: orange;
font-weight: bold;
}

main {
max-width: 800px;
margin: 20px auto;
padding: 20px;
background-color: red;
box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
}

footer {
text-align: center;
background-color: orange;
color: red;
padding: 10px;
}