body {
    font-family: Arial, sans-serif;
    margin: 0;
    line-height: 1.6;
}


header {
    text-align: center;
    padding: 50px;
}


nav {
    text-align: center;
    background: #333;
    padding: 15px;
}


nav a {
    color: white;
    margin: 15px;
    text-decoration: none;
}


section {
    padding: 30px;
    max-width: 900px;
    margin: auto;
}


.card {
    border: 1px solid #ddd;
    padding: 20px;
    margin: 15px 0;
}


footer {
    text-align: center;
    padding: 20px;
}