html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: Arial, sans-serif;
    background: #f5f5f5;
  }
  .container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    text-align: center;
    padding: 20px;
  }
  h1 {
    font-size: 4rem;
    margin-bottom: 0.5rem;
  }
  p {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
  }
  #countdown {
    font-size: 1.5rem;
    letter-spacing: 0.05em;
  }