- var blocks = 94;

.container
  - var d = 6;
  - while (d--) {
    .digit
  - }
  .surface
    - for (var b = 1;b <= blocks;++b) {
      div(class="block b" + b)
        .block-outer
          .block-inner
            .bottom
            .front
            .left
            .right
    - }
View Compiled
// container and surface
$sqSize: 20px;
$xSpaces: 27;
$ySpaces: 1;
$zSpaces: 5;
$contW: ($sqSize * $xSpaces) * 1.1;
$contH: $sqSize * $zSpaces * 2;
$xAngle: 105deg;
$zAngle: 0deg;
$prsp: 800px;

// colors
$tr: transparent;
$bl: #000;
$gry: #444;
$grn: #74d447;

// block properties
$w: 0.8; // block width
$g: (1 - $w) / 2; // half gap between blocks

// animation, transitions
$dur: 2s;
$tf: cubic-bezier(.4,.1,.6,.9);
$trans: 0.3s;
$bounce: 10px;
$tilt: 7deg;

// * Block placement *
// parameters: x-pos,y-pos,z-pos, width,depth,height, color
$blocks:
  // * Hour *
  // tens
  (1+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (2+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (3+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (1+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (2+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (3+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (1+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (2+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (3+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (1+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (2+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (3+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (1+$g,1+$g,1+$g, $w,$w,$w, $grn)
  (2+$g,1+$g,1+$g, $w,$w,$w, $grn)
  (3+$g,1+$g,1+$g, $w,$w,$w, $grn)
  // ones
  (5+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (6+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (7+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (5+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (6+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (7+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (5+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (6+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (7+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (5+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (6+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (7+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (5+$g,1+$g,1+$g, $w,$w,$w, $grn)
  (6+$g,1+$g,1+$g, $w,$w,$w, $grn)
  (7+$g,1+$g,1+$g, $w,$w,$w, $grn)
  // colon
  (9+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (9+$g,1+$g,2+$g, $w,$w,$w, $grn)
  // * Minute *
  // tens
  (11+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (12+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (13+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (11+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (12+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (13+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (11+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (12+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (13+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (11+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (12+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (13+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (11+$g,1+$g,1+$g, $w,$w,$w, $grn)
  (12+$g,1+$g,1+$g, $w,$w,$w, $grn)
  (13+$g,1+$g,1+$g, $w,$w,$w, $grn)
  // ones
  (15+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (16+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (17+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (15+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (16+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (17+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (15+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (16+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (17+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (15+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (16+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (17+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (15+$g,1+$g,1+$g, $w,$w,$w, $grn)
  (16+$g,1+$g,1+$g, $w,$w,$w, $grn)
  (17+$g,1+$g,1+$g, $w,$w,$w, $grn)
  // colon
  (19+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (19+$g,1+$g,2+$g, $w,$w,$w, $grn)
  // * Second *
  // tens
  (21+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (22+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (23+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (21+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (22+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (23+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (21+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (22+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (23+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (21+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (22+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (23+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (21+$g,1+$g,1+$g, $w,$w,$w, $grn)
  (22+$g,1+$g,1+$g, $w,$w,$w, $grn)
  (23+$g,1+$g,1+$g, $w,$w,$w, $grn)
  // ones
  (25+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (26+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (27+$g,1+$g,5+$g, $w,$w,$w, $grn)
  (25+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (26+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (27+$g,1+$g,4+$g, $w,$w,$w, $grn)
  (25+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (26+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (27+$g,1+$g,3+$g, $w,$w,$w, $grn)
  (25+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (26+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (27+$g,1+$g,2+$g, $w,$w,$w, $grn)
  (25+$g,1+$g,1+$g, $w,$w,$w, $grn)
  (26+$g,1+$g,1+$g, $w,$w,$w, $grn)
  (27+$g,1+$g,1+$g, $w,$w,$w, $grn);

@mixin placeBlock($x, $y, $z, $w, $d, $h, $c) {
  display: inherit;
  transform: translate3d(
    $sqSize*($x - 1),
    $sqSize*(-$y - ($d - 1)),
    ($sqSize*$z) + ($sqSize*($h - 1))
  );
  .block-inner div {
    background-color: $c;
  &.top, &.bottom {
      width: $sqSize * $w;
      height: $sqSize * $d;
    }
    &.top  {
      transform: rotateX(-90deg) translateY(-$sqSize*($d - 1));
    }
    &.bottom {
      transform: rotateX(-90deg) translateY(-$sqSize*($d - 1)) translateZ($sqSize*$h);
    }
    &.front, &.back {
      width: $sqSize * $w;
      height: $sqSize * $h;
    }
    &.front {
      transform: translateZ($sqSize * ($d - 1));
    }
    &.left, &.right {
      width: $sqSize * $d;
      height: $sqSize * $h;
    }
    &.right {
      transform: rotateY(-270deg) translate3d($sqSize, 0, $sqSize*($w - $d));
    }
  }
}
@mixin moveBlock($x, $y, $z) {
  transform: translate3d($sqSize * $x,$sqSize * -$y,$sqSize * $z);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  background:
    radial-gradient(circle at center,$tr, $bl 95%),
    linear-gradient($gry 2px, $tr 0) 0 0 / 20px 20px,
    linear-gradient(90deg, $gry 2px, $bl 0) 0 0 / 20px 20px;
  height: 100vh;
  margin: 0;
  overflow: hidden;
}
.container {
  animation: bounce $dur $tf infinite;
  display: flex;
  margin: auto;
  overflow: hidden;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: $contW;
  height: $contH;
  perspective: $prsp;
  transform-style: preserve-3d;
}
.surface {
  animation: tilt $dur (-$dur*0.75) $tf infinite;
  display: block;
  width: $sqSize * $xSpaces;
  height: $sqSize * $ySpaces;
  margin: auto;
  transform-style: preserve-3d;
  transform: translateY($sqSize * $zSpaces/2) rotateX($xAngle) rotateZ($zAngle);
  will-change: transform;
}
.block {
  display: none;
  transform-style: preserve-3d;
  position: absolute;
  bottom: 0;
}
.block-inner > div {
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  position: absolute;
  width: $sqSize;
  height: $sqSize;
  &.top, &.bottom, &.left, &.right {
    &:before {
      background-color: #000;
      content: "";
      width: 100%;
      height: 100%;
    }
  }
  &.top, &.bottom {
  &:before {
    opacity: 0.2;
  }
  }
  &.left, &.right {
    &:before {
      opacity: 0.4;
    }
  }
}
.block-outer, .block-inner {
  position: relative;
  width: $sqSize;
  transform-style: preserve-3d;
}
.block-outer {
  transition: transform $trans;
}
.block-inner {
  transform: rotateX(-90deg) translateZ($sqSize);
}
.back {
  transform: translateZ(-$sqSize) rotateY(180deg);
}
.left {
  transform-origin: center left;
  transform: rotateY(270deg) translateX(-$sqSize);
}
.right {
  transform-origin: top right;
}
.top, .bottom {
  transform-origin: top center;
}

// * Render blocks *
// one block only
@if length(nth($blocks,1)) == 1 {
  .b1 {
      @include placeBlock(
        nth($blocks, 1),
        nth($blocks, 2),
        nth($blocks, 3),
        nth($blocks, 4),
        nth($blocks, 5),
        nth($blocks, 6),
        nth($blocks, 7)
      );
    }
}
// more than one block
@else {
  @for $b from 1 through length($blocks) {
    .b#{$b} {
      @include placeBlock(
        nth(nth($blocks, $b), 1),
        nth(nth($blocks, $b), 2),
        nth(nth($blocks, $b), 3),
        nth(nth($blocks, $b), 4),
        nth(nth($blocks, $b), 5),
        nth(nth($blocks, $b), 6),
        nth(nth($blocks, $b), 7)
      );
    }
  }
}

// * Digit display *
.digit {
  position: absolute;
}
@for $p from 1 through 6 {
  $step: 15 * ($p - 1);
  // deal with colons
  $adj: if($p > 4,4,if($p > 2,2,0));
  $step: $step + $adj;
  ._0:nth-of-type(#{$p}) ~ .surface {
    .b#{5 + $step}, .b#{8 + $step}, .b#{11 + $step} {
      .block-outer {
        @include moveBlock(-1,0,0)
      }
    }
  }
  ._1:nth-of-type(#{$p}) ~ .surface {
    .b#{1 + $step}, .b#{4 + $step}, .b#{7 + $step}, .b#{10 + $step}, .b#{13 + $step} {
      .block-outer {
        @include moveBlock(2,0,0)
      }
    }
    .b#{2 + $step}, .b#{5 + $step}, .b#{8 + $step}, .b#{11 + $step}, .b#{14 + $step} {
      .block-outer {
        @include moveBlock(1,0,0)
      }
    }
  }
  ._2:nth-of-type(#{$p}) ~ .surface {
    .b#{4 + $step} {
      .block-outer {
        @include moveBlock(2,0,0)
      }
    }
    .b#{5 + $step} {
      .block-outer {
        @include moveBlock(1,0,0)
      }
    }
    .b#{11 + $step} {
      .block-outer {
        @include moveBlock(-1,0,0)
      }
    }
    .b#{12 + $step} {
      .block-outer {
        @include moveBlock(-2,0,0)
      }
    }
  }
  @if $p > 1 {
    ._3:nth-of-type(#{$p}) ~ .surface {
      .b#{4 + $step}, .b#{10 + $step} {
        .block-outer {
          @include moveBlock(2,0,0)
        }
      }
      .b#{5 + $step}, .b#{11 + $step} {
        .block-outer {
          @include moveBlock(1,0,0)
        }
      }
    }
    ._4:nth-of-type(#{$p}) ~ .surface {
      .b#{2 + $step}, .b#{5 + $step} {
        .block-outer {
          @include moveBlock(-1,0,0)
            }
      }
      .b#{10 + $step}, .b#{13 + $step} {
        .block-outer {
          @include moveBlock(2,0,0)
            }
      }
      .b#{11 + $step}, .b#{14 + $step} {
        .block-outer {
          @include moveBlock(1,0,0)
            }
      }
    }
    ._5:nth-of-type(#{$p}) ~ .surface {
      .b#{5 + $step} {
        .block-outer {
          @include moveBlock(-1,0,0)
            }
      }
      .b#{6 + $step} {
        .block-outer {
          @include moveBlock(-2,0,0)
            }
      }
      .b#{10 + $step} {
        .block-outer {
          @include moveBlock(2,0,0)
            }
      }
      .b#{11 + $step} {
        .block-outer {
          @include moveBlock(1,0,0)
            }
      }
    }
    @if $p % 2 == 0 {
      ._6:nth-of-type(#{$p}) ~ .surface {
        .b#{5 + $step} {
          .block-outer {
            @include moveBlock(-1,0,0)
              }
        }
        .b#{6 + $step} {
          .block-outer {
            @include moveBlock(-2,0,0)
              }
        }
        .b#{11 + $step} {
          .block-outer {
            @include moveBlock(1,0,0)
              }
        }
      }
      ._7:nth-of-type(#{$p}) ~ .surface {
        .b#{4 + $step}, .b#{7 + $step}, .b#{10 + $step}, .b#{13 + $step} {
          .block-outer {
            @include moveBlock(2,0,0)
              }
        }
        .b#{5 + $step}, .b#{8 + $step}, .b#{11 + $step}, .b#{14 + $step} {
          .block-outer {
            @include moveBlock(1,0,0)
              }
        }
      }
      ._8:nth-of-type(#{$p}) ~ .surface {
        .b#{5 + $step}, .b#{11 + $step} {
          .block-outer {
            @include moveBlock(1,0,0)
              }
        }
      }
      ._9:nth-of-type(#{$p}) ~ .surface {
        .b#{5 + $step}, .b#{11 + $step} {
          .block-outer {
            @include moveBlock(1,0,0)
              }
        }
        .b#{10 + $step} {
          .block-outer {
            @include moveBlock(2,0,0)
              }
        }
      }
    }
  }
}
/* Animations */
@keyframes bounce {
  from, 50%, to {
    transform: translateY(0);
  }
  25%, 75% {
    transform: translateY($bounce);
  }
}
@keyframes tilt {
  from, to {
    transform: translateY($sqSize * $zSpaces/2) rotateX($xAngle) rotateZ(-$tilt);
  }
  50% {
    transform: translateY($sqSize * $zSpaces/2) rotateX($xAngle) rotateZ($tilt);
  }
}
window.addEventListener("load",update);
function update() {
	let time = new Date(),
		hr = time.getHours(),
		min = time.getMinutes(),
		sec = time.getSeconds();
	
	// prepend 0s to single digits
	if (hr < 10)
		hr = "0" + hr;
	if (min < 10)
		min = "0" + min;
	if (sec < 10)
		sec = "0" + sec;
	
	let timeStr = `${hr}${min}${sec}`,
		digits = document.querySelectorAll(".digit"),
		digitArr = [];
	
	for (let d in digits) {
		d = +d;
		if (d < digits.length) {
			digitArr[d] = timeStr.substr(d,1);
			digits[d].className = "digit _" + digitArr[d];
		}
	}
	setTimeout(update,1000);
}

External CSS

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External JavaScript

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