body {
    margin: 0;
    padding: 0;
    background: #0f172a;
    color: white;
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.card {
    background: #1e293b;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

h1 {
    font-size: 42px;
    margin-bottom: 10px;
}

p {
    color: #cbd5e1;
    margin-bottom: 20px;
}

button {
    background: #3b82f6;
    border: none;
    color: white;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    opacity: 0.9;
}