.countdown-container {
  color: #333;
  margin: 0 auto;
  text-align: center;
}

#headline {
  font-weight: normal;
  letter-spacing: 0.125rem;
  text-transform: uppercase;
  font-family: -apple-system, "BlinkMacSystemFont", "Segoe UI", "Roboto", "Oxygen-Sans", "Ubuntu, Cantarell", "Helvetica Neue", sans-serif;
}
#sub-line {
  font-weight: normal;
  text-transform: uppercase;
  font-size: 1.5rem;
  color: gray;
}

#countdown ul li {
  display: inline-block;
  font-size: 1.5em;
  list-style-type: none;
  padding: 1em;
  text-transform: uppercase;
}

#countdown ul li span {
  display: block;
  font-size: 4.5rem;
}

.message {
  font-size: 4rem;
}

#content {
  display: none;
  padding: 1rem;
}

.emoji {
  padding: 0 0.25rem;
}

@media all and (max-width: 768px) {
  h1 #headline {
    font-size: 1.5rem;
  }
  #sub-line {
    font-size: 1.2rem;
  }

  #countdown ul li {
    font-size: 1.125rem;
    padding: 0.75rem;
  }

  #countdown ul li span {
    font-size: 3.375rem;
  }
}