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

header, footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1em 0;
}

nav a {
    color: white;
    margin: 0 1em;
    text-decoration: none;
}

main {
    padding: 2em;
}

h2 {
    color: #333;
}

.btn {
    background-color: #0066cc;
    color: white;
    padding: 0.5em 1em;
    text-decoration: none;
    border: none;
    border-radius: 5px;
}