count.css

#countdown {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

.countdown-item {
  font-size: 20px;
  border-radius: 50%;
  text-align: center;
  width: 100px;
  height: 100px;
  line-height: 100px;
  position: relative;
  opacity: 0;
  margin: 5px;
}

.countdown-item.show {
  animation: fadein 2s forwards;
}

.countdown-item::before {
  position: absolute;
  content: ' ';
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background-color: #fff;
  left: 0;
  top: 0;
  opacity: .1;
}

.countdown-item.days {
  animation-delay: 1s;
}

.countdown-item.hours {
  animation-delay: 1.5s;
}

.countdown-item.minutes {
  animation-delay: 2s;
}

.countdown-item.seconds {
  animation-delay: 2.5s;
}

.countdown-item.days::after {
  content: attr(data-days);
}

.countdown-item.hours::after {
  content: attr(data-hours);
}

.countdown-item.minutes::after {
  content: attr(data-minutes);
}

.countdown-item.seconds::after {
  content: attr(data-seconds);
}

@keyframes fadein {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}