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CSS

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JavaScript

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HTML 

              
                //- Front
//- Back
//- Right
//- Left
//- Top
//- Bottom
mixin cuboid(className)
  .cuboid(class=className)
    - let s = 0
    while s < 6
      .cuboid__side
      - s++
.scene
  //- Plane that all the 3D stuff sits on
  .plane
    +cuboid()
!

CSS 

              
                *
  box-sizing border-box

:root
  --perspective 800
  --rotate-x -15
  --rotate-y -40
  --transform-style preserve-3d
  --cuboid-width 10
  --cuboid-height 10
  --cuboid-depth 10
  --exploded 0

body
  min-height 100vh
  // overflow hidden
  background hsl(0, 0%, 90%)

.scene
  perspective calc(var(--perspective, 800) * 1px)
  transform-style var(--transform-style)
  height 100vh
  width 100vw
  display flex
  align-items center
  justify-content center

.plane
  height calc(var(--plane-height, 25) * 1vmin)
  width calc(var(--plane-width, 25) * 1vmin)
  transform-style var(--transform-style)
  transform rotateX(calc(var(--rotate-x, -24) * 1deg)) rotateY(calc(var(--rotate-y, -24) * 1deg)) rotateX(90deg) translate3d(0, 0, 0)


// This is what makes the CSS variable powered cuboid
.cuboid
  --width var(--cuboid-width, 15)
  --height var(--cuboid-height, 10)
  --depth var(--cuboid-depth, 4)
  height calc(var(--depth) * 1vmin)
  width calc(var(--width) * 1vmin)
  position absolute
  transform translate3d(calc(var(--x, 0) * 1vmin), calc(var(--y, 0) * 1vmin), calc(var(--z, 0) * 1vmin)) rotateX(calc(var(--rotate-cuboid-x, 0) * 1deg)) rotateY(calc(var(--rotate-cuboid-y, 0) * 1deg)) rotateZ(calc(var(--rotate-cuboid-z, 0) * 1deg))
  transform-style var(--transform-style)

  &__side
    transform-style var(--transform-style)
    transition transform 0.25s ease

  & > div:nth-of-type(1)
    height calc(var(--height) * 1vmin)
    width 100%
    transform-origin 50% 50%
    transform rotateX(-90deg)
    position absolute
    top 50%
    left 50%
    transform translate(-50%, -50%) rotateX(-90deg) translate3d(0, 0, calc((var(--depth) / (2 - var(--exploded))) * 1vmin))

  & > div:nth-of-type(2)
    height calc(var(--height) * 1vmin)
    width 100%
    transform-origin 50% 50%
    transform translate(-50%, -50%) rotateX(-90deg) rotateY(180deg) translate3d(0, 0, calc((var(--depth) / (2 - var(--exploded))) * 1vmin))
    position absolute
    top 50%
    left 50%

  & > div:nth-of-type(3)
    height calc(var(--height) * 1vmin)
    width calc(var(--depth) * 1vmin)
    transform translate(-50%, -50%) rotateX(-90deg) rotateY(90deg) translate3d(0, 0, calc((var(--width) / (2 - var(--exploded))) * 1vmin))
    position absolute
    top 50%
    left 50%

  & > div:nth-of-type(4)
    height calc(var(--height) * 1vmin)
    width calc(var(--depth) * 1vmin)
    transform translate(-50%, -50%) rotateX(-90deg) rotateY(-90deg) translate3d(0, 0, calc((var(--width) / (2 - var(--exploded))) * 1vmin))
    position absolute
    top 50%
    left 50%

  & > div:nth-of-type(5)
    height calc(var(--depth) * 1vmin)
    width calc(var(--width) * 1vmin)
    transform translate(-50%, -50%) translate3d(0, 0, calc((var(--height) / (2 - var(--exploded))) * 1vmin))
    position absolute
    top 50%
    left 50%

  & > div:nth-of-type(6)
    height calc(var(--depth) * 1vmin)
    width calc(var(--width) * 1vmin)
    transform translate(-50%, -50%) translate3d(0, 0, calc((var(--height) / (2 - var(--exploded))) * -1vmin)) rotateX(180deg)
    position absolute
    top 50%
    left 50%

.cuboid
  top 50%
  left 50%
  transform translate(-50%, -50%)

.cuboid div
  background hsla(90, 80%, 50%, 0.15)
  border 0.5vmin solid #111
!

JS 

              
                // Purely for debugging purposes
const {
  dat: { GUI },
} = window

const CONTROLLER = new GUI()
const CONFIG = {
  'rotate-x': -24,
  'rotate-y': -40,
  exploded: false,
  'transform-style': true,
}
const UPDATE = () => {
  Object.entries(CONFIG).forEach(([key, value]) => {
    document.documentElement.style.setProperty(`--${key}`, value)
  })
  document.documentElement.style.setProperty(
    '--transform-style',
    CONFIG['transform-style'] ? 'preserve-3d' : 'flat'
  )
  document.documentElement.style.setProperty(
    '--exploded',
    CONFIG['exploded'] ? 1 : 0
  )
}
const PLANE_FOLDER = CONTROLLER.addFolder('Plane')
PLANE_FOLDER.add(CONFIG, 'rotate-x', -360, 360, 1)
  .name('Rotate X (deg)')
  .onChange(UPDATE)
PLANE_FOLDER.add(CONFIG, 'rotate-y', -360, 360, 1)
  .name('Rotate Y (deg)')
  .onChange(UPDATE)
CONTROLLER.add(CONFIG, 'exploded')
  .name('Exploded view')
  .onChange(UPDATE)
CONTROLLER.add(CONFIG, 'transform-style')
  .name('Transform style 3D')
  .onChange(UPDATE)
UPDATE()
!
999px

Console