html, body {
  margin: 0;
  padding: 0;
}
#container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: #222;
  color: #fff;
  text-align: center;
  font-family: sans-serif;
}
#state {
  font-size: 4rem;
  font-weight: bold;
}
#duration {
  margin-top: 1rem;
  font-size: 2rem;
}