html, body {
  font-family: serif;
  font-size: 16px;
}

.countdown-container {
  margin: 5rem;
}

.time-container {
  display: flex;
}

.time {
  margin: .2rem;
background-color: lightblue;
border-radius: 1rem;
padding: 2rem;
}

#hour,#min,#sec {
  font-size: 3rem;
  margin-right: 1rem;
}