html, body {
  height: 100%;
  width: 100%;
  font-family: monospace;
  background-color: black;
  overflow: hidden;
}

/* Container class — optional if you want it */
.container {
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  position: fixed;
  filter: contrast(20);
  background-color: black;
  overflow: hidden;
}

/* Countdown number styling */
#counter {
  color: #e6ffe6;
  font-size: 8rem;
  font-weight: 700;
  text-align: center;
  text-transform: uppercase;
  line-height: 1;
  filter: blur(0.2rem);
  display: block;
  transition: all 1.5s ease;
  opacity: 0;
  filter: blur(0.6rem);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: letteranim 1s ease forwards;
}

/* Glow in/out animation reused for each new number */
@keyframes letteranim {
  0% {
    opacity: 0;
    filter: blur(0.6rem);
  }
  40% {
    opacity: 1;
    filter: blur(0.2rem);
  }
  100% {
    opacity: 0;
    filter: blur(0.6rem);
  }
}