.countdown-timer{
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  
}
.countdown-timer .box {
  text-align: center;
  position: relative;
  padding: 1.5rem;
}
.countdown-timer .label {
  font-size: 1.2rem;
}
.countdown-timer .box .number {
  font-size: 3rem;
}

.countdown-timer .box:nth-child(n+2):before {
  content: ':';
  font-size: 3rem;
  position: absolute;
  top: 1.3rem;  
  left: 0;
}