@import url('https://fonts.googleapis.com/css2?family=VT323&display=swap');
body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 75vh;
  margin: 0 auto;
  background-color: #1a1a1a;
}


h1 {
  font-family: "VT323", sans-serif;
  font-size: 8vw;
  line-height: 1;
  margin: 0 auto;
  left: auto;
  transform: translate(-50%, -50%);
  color: #2d2d2d00;
  position: absolute;
  letter-spacing: .8rem;
  text-transform: uppercase;
}
h1:before {
  content: attr(data-heading);
  overflow: hidden;
  text-align: center;
  color: #ffcc00;
  width: 100%;
  margin: 0 auto;
  top: 25%;
  left: 50%;
  z-index: 5;
  position: absolute;
  text-shadow: none;
  -webkit-animation: flicker 3s linear infinite;
          animation: flicker 3s linear infinite;
}

@-webkit-keyframes flicker {
  0%, 19.999%, 22%, 62.999%, 64%, 64.999%, 70%, 100% {
    opacity: 0.99;
    text-shadow: -1px -1px 0 rgba(255, 255, 255, 0.4), 1px -1px 0 rgba(255, 255, 255, 0.4), -1px 1px 0 rgba(255, 255, 255, 0.4), 1px 1px 0 rgba(255, 255, 255, 0.4), 0 -2px 8px, 0 0 2px, 0 0 5px #ff7e00, 0 0 15px #ff4444, 0 0 2px #ff7e00, 0 2px 3px #000;
  }
  20%, 21.999%, 63%, 63.999%, 65%, 69.999% {
    opacity: 0.4;
    text-shadow: none;
  }
}

@keyframes flicker {
  0%, 19.999%, 22%, 62.999%, 64%, 64.999%, 70%, 100% {
    opacity: 0.99;
    text-shadow: -1px -1px 0 rgba(255, 255, 255, 0.4), 1px -1px 0 rgba(255, 255, 255, 0.4), -1px 1px 0 rgba(255, 255, 255, 0.4), 1px 1px 0 rgba(255, 255, 255, 0.4), 0 -2px 8px, 0 0 2px, 0 0 5px #ff7e00, 0 0 15px #ff4444, 0 0 2px #ff7e00, 0 2px 3px #000;
  }
  20%, 21.999%, 63%, 63.999%, 65%, 69.999% {
    opacity: 0.4;
    text-shadow: none;
  }
}