.container
  .barcode
    -for(var i = 0; i < 30; i++)
      div
    p.
      47

$duration: 5s;
@function romb($from, $to) {
  @return (random($to - $from) + $from - 1%);
}

html {
  background-color: #000;
}
body {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
}
.container {
  margin: 0 auto;
  font-size: 0.5vh;
}
.barcode {
  width: 94em;
  height: 71em;
  margin: 0 auto;
  position: relative;
}
.barcode > div {
  background-color: #fff;
  float: left;
  margin-right: 2em;
  transform-origin: 0 0;
}
.barcode div:nth-child(1),
.barcode div:nth-child(2),
.barcode div:nth-child(15),
.barcode div:nth-child(16),
.barcode div:nth-child(29),
.barcode div:nth-child(30) {
  height: 45em;
}
.barcode div:nth-child(1),
.barcode div:nth-child(2),
.barcode div:nth-child(3),
.barcode div:nth-child(5),
.barcode div:nth-child(8),
.barcode div:nth-child(10),
.barcode div:nth-child(12),
.barcode div:nth-child(13),
.barcode div:nth-child(15),
.barcode div:nth-child(16),
.barcode div:nth-child(18),
.barcode div:nth-child(19),
.barcode div:nth-child(22),
.barcode div:nth-child(25),
.barcode div:nth-child(27),
.barcode div:nth-child(28),
.barcode div:nth-child(29),
.barcode div:nth-child(30) {
  width: 1em;
}
.barcode div:nth-child(3),
.barcode div:nth-child(4),
.barcode div:nth-child(5),
.barcode div:nth-child(6),
.barcode div:nth-child(7),
.barcode div:nth-child(8),
.barcode div:nth-child(9),
.barcode div:nth-child(10),
.barcode div:nth-child(11),
.barcode div:nth-child(12),
.barcode div:nth-child(13),
.barcode div:nth-child(14),
.barcode div:nth-child(17),
.barcode div:nth-child(18),
.barcode div:nth-child(19),
.barcode div:nth-child(20),
.barcode div:nth-child(21),
.barcode div:nth-child(22),
.barcode div:nth-child(23),
.barcode div:nth-child(24),
.barcode div:nth-child(25),
.barcode div:nth-child(26),
.barcode div:nth-child(27),
.barcode div:nth-child(28) {
  height: 40em;
}
.barcode div:nth-child(6),
.barcode div:nth-child(7),
.barcode div:nth-child(9),
.barcode div:nth-child(11),
.barcode div:nth-child(14),
.barcode div:nth-child(23),
.barcode div:nth-child(24) {
  width: 2em;
}
.barcode div:nth-child(17),
.barcode div:nth-child(20),
.barcode div:nth-child(21),
.barcode div:nth-child(26) {
  width: 3em;
}
.barcode div:nth-child(4) {
  width: 4em;
}
.barcode div:nth-child(1),
.barcode div:nth-child(2),
.barcode div:nth-child(3),
.barcode div:nth-child(4),
.barcode div:nth-child(6),
.barcode div:nth-child(7),
.barcode div:nth-child(8),
.barcode div:nth-child(11),
.barcode div:nth-child(13),
.barcode div:nth-child(14),
.barcode div:nth-child(15),
.barcode div:nth-child(16),
.barcode div:nth-child(18),
.barcode div:nth-child(19),
.barcode div:nth-child(22),
.barcode div:nth-child(24),
.barcode div:nth-child(25),
.barcode div:nth-child(29),
.barcode div:nth-child(30) {
  margin-right: 1em;
}
.barcode div:nth-child(12),
.barcode div:nth-child(17),
.barcode div:nth-child(20),
.barcode div:nth-child(21),
.barcode div:nth-child(23),
.barcode div:nth-child(26),
.barcode div:nth-child(28) {
  margin-right: 2em;
}
.barcode div:nth-child(5),
.barcode div:nth-child(9),
.barcode div:nth-child(10),
.barcode div:nth-child(27) {
  margin-right: 3em;
}
.barcode p {
  color: #fff;
  font: 8em/100% "OCRB";
  position: absolute;
  top: 4.2em;
  right: 0.78em;
  animation: fortyseven 5s infinite forwards;
}
@keyframes fortyseven {
  0%,
  20%,
  40%,
  60%,
  80%,
  100% {
    opacity: 0;
  }
  10%,
  30%,
  50%,
  70%,
  90% {
    opacity: 1;
  }
}
@for $i from 1 through 30 {
  $grow-start: romb(1%, 30%);
  $grow-end: romb(47%, 69%);
  $fade-start: romb(72%, 82%);
  $fade-end: romb(88%, 94%);

  @keyframes bar-#{$i} {
    0%,
    #{$grow-start} {
      transform: scaleY(0);
    }
    #{$grow-end} {
      transform: scaleY(1);
    }
    #{$fade-start} {
      opacity: 1;
    }
    #{$fade-end} {
      opacity: 0;
    }
    99.5% {
      transform: scaleY(1);
      opacity: 0;
    }
    100% {
      transform: scaleY(0);
      opacity: 0;
    }
  }

  .barcode > div:nth-child(#{$i}) {
    animation: bar-#{$i} $duration ease-out infinite forwards;
  }
}