html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
}

#countdown {
  font-family: sans-serif;
  font-size: 50vh;
  font-weight: bold;
  text-align: center;
  box-sizing: border-box;
  overflow-wrap: break-word;
  word-break: break-word;
}