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

header {
background: #003366;
color: white;
padding: 15px;
text-align: center;
}

nav {
background: #222;
padding: 10px;
text-align: center;
}

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

section {
background: white;
margin: 20px;
padding: 20px;
}

.btn {
background: #28a745;
color: white;
padding: 10px 15px;
text-decoration: none;
}

footer {
background: #003366;
color: white;
text-align: center;
padding: 10px;
}