body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    font-family: Arial, sans-serif;
    background: #0f172a;
    color: #e2e8f0;
  }
  
  .card {
    background: #1e293b;
    padding: 24px 28px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    text-align: center;
  }