body {
    background-color: lightblue;
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: #333;
    text-align: center;
}

header {
    background: #222;
    color: #fff;
    padding: 1em;
}

main {
    background: white;
    margin: 20px auto;
    padding: 20px;
    max-width: 800px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
}

h1 {
    font-size: 2.5em;
    margin-bottom: 0;
}

h2 {
    margin-top: 0;
    color: #555;
}

nav a {
    color: #fff;
    margin: 0 10px;
    text-decoration: none;
    font-weight: bold;
}