body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background: #2c3e50;
    color: white;
    padding: 1rem;
    text-align: center;
}

header nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
}

header nav a:hover {
    text-decoration: underline;
}

main {
    flex: 1;
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    border-radius: 8px;
    width: 90%;
}

footer {
    text-align: center;
    padding: 1rem;
    background: #2c3e50;
    color: white;
}