body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: #1e1e1e;
  color: #fff;
  font-family: 'Arial', sans-serif;
}

.clock-container {
  text-align: center;
  background: #333;
  padding: 40px 60px;
  border-radius: 15px;
  box-shadow: 0 0 20px #00ffcc;
}

#clock {
  font-size: 4rem;
  margin-top: 20px;
  letter-spacing: 2px;
  color: #00ffcc;
  font-weight: bold;
}