body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    font-family: system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
.container {
    text-align: center;
    color: white;
}
h1 {
    font-size: 3rem;
    margin: 0 0 1rem;
}
button {
    padding: 12px 24px;
    font-size: 1rem;
    background: white;
    color: #667eea;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
}
button:hover {
    transform: scale(1.05);
}