body {
  --duration: 1s;
  --timing-function: cubic-bezier(0.68, -0.55, 0.265, 1.55);

  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  width: 100vw;
  margin: 0;
  padding: 0;

  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
}
.container {
  position: absolute;

  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;

  transition: var(--duration) var(--timing-function);
  transition-property: transform, opacity;
}
.container.hide {
  transform: scale(0);
}
.container .countdown {
  position: relative;

  display: flex;
  justify-content: center;
  align-items: center;

  height: 3rem;
  width: 10rem;

  overflow: hidden;
}
.container .countdown .cd {
  position: absolute;

  font-size: 2rem;
  font-weight: bold;
  color: #2ed573;
  transform-origin: center 200%;
  transform: rotate(180deg);

  transition: var(--duration) var(--timing-function);
  transition-property: transform;
}
.container .countdown .cd.show {
  transform: rotate(0deg);
}
.container .countdown .cd.hide {
  transform: rotate(-180deg);
}
.go {
  position: absolute;

  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;

  transform: scale(0);
  opacity: 0;

  transition: var(--duration) var(--timing-function);
  transition-property: transform, opacity;
}
.go.show {
  transform: scale(1);
  opacity: 1;
}