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

#main_content {
  display: flex;
  height: 100%;
  justify-content: center;
  align-items: center;
}

#center {
  /* background-color: lightblue; */
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: min(90vw, 90vh);
  height: min(90vw, 90vh);
}

#count_down {
  display: flex;
  justify-content: space-between;
  align-items: center;
}