body {
    background-color: #f8f9fa;
    font-family: Arial, sans-serif;
}

header {
    background-color: #343a40;
    color: white;
    padding: 10px 0;
}

header .navbar-brand {
    color: white;
}

header .navbar-nav .nav-link {
    color: white;
}

main {
    text-align: center;
}

main img {
    max-width: 300px;
    margin-top: 20px;
}