body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f7f9fc;
    color: #333;
}

header {
    background: #111827;
    color: white;
    padding: 20px;
    text-align: center;
}

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

.container {
    max-width: 900px;
    margin: 40px auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
}

h1, h2 {
    color: #111827;
}

button {
    background: #2563eb;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

footer {
    text-align: center;
    padding: 20px;
    background: #111827;
    color: white;
    margin-top: 40px;
}