body {
    font-family: sans-serif;
    max-width: 600px;
    margin: 40px auto;
    padding: 0 20px;
    background: #f4f4f9;
    color: #333;
}

h1 {
    color: #222;
}

.card {
    background: white;
    padding: 20px;
    margin-top: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn {
    display: inline-block;
    background: #007bff;
    color: white;
    padding: 10px 15px;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 10px;
    transition: background 0.2s;
}

.btn:hover {
    background: #0056b3;
}