body {
  font-family: 'Arial', sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
  background-color: #f4f4f4;
}

.countdown-container {
  text-align: center;
}

#countdown {
  font-size: 2em;
  margin-top: 20px;
}