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HTML

              
                - const URL = "https://css-tricks.com"
//- Front
//- Back
//- Right
//- Left
//- Top
//- Bottom
mixin cuboid(className)
  .cuboid(class=className)
    - let s = 0
    while s < 6
      .cuboid__side
      - s++
.scene__wrapper
  .scene
    //- Plane that all the 3D stuff sits on
    .plane
      .studio
        +cuboid('floor')
        +cuboid('rug')
        +cuboid('wall wall--left')
        .window
          +cuboid('window__frame window__frame--top')
          +cuboid('window__frame window__frame--left')
          +cuboid('window__frame window__frame--right')
          +cuboid('window__frame window__frame--bottom')
          +cuboid('window__frame window__frame--middle')
        +cuboid('wall wall--right-left')
        +cuboid('wall wall--right-upper')
        +cuboid('wall wall--right-right')
        +cuboid('skirting skirting--left')
        +cuboid('skirting skirting--right')
        +cuboid('windowsill')
        +cuboid('wall wall--right-lower')
        +cuboid('bear-canvas')
        +cuboid('jfdi')
              
            
!

CSS

              
                *
  box-sizing border-box
  transform-style preserve-3d

:root
  --blur 1vmin
  --perspective 2000
  --rotate-x -20
  --rotate-y -45
  --plane-height 50
  --plane-width 50
  --dark 0
  --zoomed 0
  --scale calc(0.75 + (var(--zoomed) * 4))
  --wall-thickness 4
  --cm calc((var(--plane-height) / 240))
  --transition 0.2s
  // Colors
  --floor-shade-one hsl(30, 40%, 40%)
  --floor-shade-two hsl(30, 40%, 60%)
  --floor-shade-three hsl(30, 40%, 80%)
  --windowsill-shade-one hsl(35, 50%, 50%)
  --windowsill-shade-two hsl(35, 50%, 40%)
  --windowsill-shade-three hsl(35, 50%, 30%)
  --wall-shade-one hsl(0, 0%, 98%)
  --wall-shade-two hsl(0, 0%, 95%)
  --wall-shade-three hsl(0, 0%, 90%)
  --wall-shade-four hsl(0, 0%, 85%)
  --skirting-one hsl(0, 0%, 93%)
  --skirting-two hsl(0, 0%, 88%)
  --fade-one hsl(0, 80%, 85%)
  --fade-two hsl(200, 80%, 85%)
  --fade-three hsl(280, 80%, 85%)
  --fade-four hsl(120, 80%, 85%)
  --cube hsl(0, 0%, 95%)
  --leg-one hsl(0, 0%, 10%)
  --leg-two hsl(0, 0%, 12%)
  --leg-three hsl(0, 0%, 14%)
  --leg-four hsl(0, 0%, 16%)
  --rug hsl(210, 40%, 10%)
  --peripheral-one hsl(0, 0%, 20%)
  --peripheral-two hsl(0, 0%, 30%)
  --peripheral-three hsl(0, 0%, 40%)
  --peripheral-four hsl(0, 0%, 50%)
  --mac-one hsl(0, 0%, 80%)
  --mac-two hsl(0, 0%, 70%)
  --blind hsl(30, 50%, 90%)
  --mac-three hsl(0, 0%, 60%)
  --pot-one hsl(20, 50%, 50%)
  --pot-two hsl(20, 50%, 40%)
  --pot-three hsl(20, 50%, 30%)
  --chair-one hsl(0, 0%, 0%)
  --chair-two hsl(0, 0%, 10%)
  --chair-three hsl(0, 0%, 20%)
  --chair-four hsl(0, 0%, 30%)
  --chair-accent-one hsl(0, 0%, 95%)
  --chair-accent-two hsl(0, 60%, 60%)
  --bg hsl(210, 80%, 90%)
  --light hsl(0, 0%, 80%)
  --icon hsl(210, 50%, 60%)

// We're saying that 50vmin === 240cm
audio
  display none
body
  min-height 100vh
  overflow hidden

.dg.ac
  z-index 100
  transform translate3d(0, 0, 50vmin)

.scene
  perspective calc(var(--perspective, 800) * 1px)
  transform-style preserve-3d
  height 100vh
  width 100vw
  display flex
  align-items center
  justify-content center
  transform scale(var(--scale)) translate3d(0, 0, 50vmin)

  &__wrapper
    transition background var(--transition)
    background var(--bg)

.plane
  height calc(var(--plane-height, 25) * 1vmin)
  width calc(var(--plane-width, 25) * 1vmin)
  transform-style preserve-3d
  transform rotateX(calc((var(--rotate-x, -24) - (var(--zoomed) * var(--rotate-x, -24))) * 1deg)) rotateY(calc(((var(--rotate-y, -24) - (var(--zoomed) * var(--rotate-y, -24))) + (var(--zoomed) * -90)) * 1deg)) rotateX(90deg) translate3d(0, 0, 0)

  &:before
    content ''
    background hsla(0, 0%, 0%, 0.5)
    filter blur(var(--blur))
    height 112%
    width 112%
    position absolute
    top -8%
    left -10%
    transform translate3d(0, 0, -11vmin)
    z-index -1

// 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 rotateZ(calc(var(--starting-rotation, 0) * 1deg)) 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 preserve-3d

  &__side
    transform-style preserve-3d

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

.studio
  height 100%
  width 100%
  transform translate3d(0, 0, calc((-10 + (var(--zoomed) * -10)) * 1vmin))

.floor
  --height 1
  --width calc(50 + var(--wall-thickness))
  --depth calc(50 + var(--wall-thickness))
  --z -0.5
  --y calc(var(--wall-thickness) * -1)
  --x calc(var(--wall-thickness) * -1)
  transition background var(--transition)

  div:not(.studio__shadow)
    background var(--floor-shade-three)

  div:nth-of-type(1)
    background var(--floor-shade-one)
  div:nth-of-type(3)
    background var(--floor-shade-two)

  div:nth-of-type(5)
    transition filter var(--transition)
    filter brightness(1)

    &:after
      content ''
      position absolute
      top 0
      left 0
      height 100%
      width 100%
      transform rotate(90deg)
      background url('https://images.pexels.com/photos/235994/pexels-photo-235994.jpeg?auto=compress&cs=tinysrgb&dpr=3&h=750&w=1260') 0 0 / 15vmin 15vmin

.wall
  transition background var(--transition)
  &--left
    --height calc(220 * var(--cm))
    --width var(--wall-thickness)
    --depth calc((240 * var(--cm)) + var(--wall-thickness))
    --z calc(110 * var(--cm))
    --x calc(var(--wall-thickness) * -1)
    --y calc(var(--wall-thickness) * -1)

    div
      &:nth-of-type(1)
        background var(--wall-shade-four)
      &:nth-of-type(2)
        background var(--wall-shade-one)
      &:nth-of-type(3)
        background var(--wall-shade-one)
        overflow hidden

      &:nth-of-type(5)
        background var(--wall-shade-three)
      &:nth-of-type(4)
      &:nth-of-type(6)
        background var(--wall-shade-two)

  &--right-lower
    --height calc(100 * var(--cm))
    --width 50
    --depth var(--wall-thickness)
    --z calc(50 * var(--cm))
    --y calc(var(--wall-thickness) * -1)

    &:after
      content ''
      height 30%
      width calc((114 * var(--cm)) * 1vmin)
      top 102%
      left calc((22 * var(--cm)) * 1vmin)
      filter blur(calc(0.75 * var(--blur)))
      background hsla(0, 0%, 0%, 0.5)
      position absolute
      transform-origin 50% 0
      transform rotateX(90deg) translate(0, calc((44 * var(--cm)) * 1vmin))

    div
      background var(--wall-shade-four)
      &:nth-of-type(5)
        background var(--wall-shade-three)
      &:nth-of-type(2)
      &:nth-of-type(3)
        background var(--wall-shade-one)

  &--right-left
    --height calc(220 * var(--cm))
    --width calc(22 * var(--cm))
    --depth var(--wall-thickness)
    --z calc(110 * var(--cm))
    --y calc(var(--wall-thickness) * -1)

    div
      background var(--wall-shade-four)
      &:nth-of-type(3)
        background var(--wall-shade-two)
      &:nth-of-type(2)
        background var(--wall-shade-one)


  &--right-upper
    --height calc(22 * var(--cm))
    --width calc(240 * var(--cm))
    --depth var(--wall-thickness)
    --z calc(209 * var(--cm))
    --y calc(var(--wall-thickness) * -1)

    div
      background var(--wall-shade-four)

      &:nth-of-type(2)
      &:nth-of-type(3)
        background var(--wall-shade-one)
      &:nth-of-type(5)
        background var(--wall-shade-three)

  &--right-right
    --height calc(220 * var(--cm))
    --width calc((240 - 136) * var(--cm))
    --depth var(--wall-thickness)
    --z calc(110 * var(--cm))
    --y calc(var(--wall-thickness) * -1)
    --x calc(136 * var(--cm))


    div
      background var(--wall-shade-four)

      &:nth-of-type(1):after
        content ''
        position absolute
        height 24%
        width 70%
        border-radius 50%
        background none
        filter blur(calc(2 * var(--blur)))
        top 15%
        left 15%
        opacity 0.75

      &:nth-of-type(2)
      &:nth-of-type(3)
        background var(--wall-shade-one)
      &:nth-of-type(4)
        background var(--wall-shade-four)
      &:nth-of-type(5)
        background var(--wall-shade-three)

.windowsill
  --height calc(2 * var(--cm))
  --depth calc(22 * var(--cm))
  --width calc(114 * var(--cm))
  --z calc(100 * var(--cm) )
  --x calc(22 * var(--cm))
  --y calc(var(--wall-thickness) * -0.8)

  div
    background var(--windowsill-shade-one)

    &:nth-of-type(1)
      transition filter var(--transition)
      filter brightness(0.5)
      background url("https://images.pexels.com/photos/172276/pexels-photo-172276.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500")
    &:nth-of-type(2)
      background var(--wall-shade-one)
    &:nth-of-type(5)
      transition filter var(--transition)
      background url("https://images.pexels.com/photos/172276/pexels-photo-172276.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500")
    &:nth-of-type(6)
      background var(--windowsill-shade-three)


.skirting
  &--left
    --height calc(8 * var(--cm))
    --width calc(2 * var(--cm))
    --depth calc(240 * var(--cm))
    --z calc(4 * var(--cm))
    div
      background var(--skirting-one)
      &:nth-of-type(3)
        background var(--skirting-one)
      &:nth-of-type(5)
        background var(--skirting-one)
  &--right
    --height calc(8 * var(--cm))
    --width calc(240 * var(--cm))
    --depth calc(2 * var(--cm))
    --z calc(4 * var(--cm))
    div
      background var(--skirting-two)

.rug
  --height calc(1 * var(--cm))
  --width calc(140 * var(--cm))
  --depth calc(140 * var(--cm))
  --x calc(80 * var(--cm))
  --y calc(50 * var(--cm))
  --z calc(0.5 * var(--cm))

  div
    background var(--rug)

    &:nth-of-type(5)
      transition filter var(--transition)
      filter brightness(1)
      background url('https://images.pexels.com/photos/3707669/pexels-photo-3707669.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940')
      background-size cover

.bear-canvas
  --width calc(60 * var(--cm))
  --height calc(60 * var(--cm))
  --depth calc(2 * var(--cm))
  --z calc(80 * var(--cm))
  --x calc(168 * var(--cm))
  --y var(--cm)

  div
    background hsl(0, 0%, 95%)
    filter brightness(1)
    transition filter var(--transition)

    &:nth-of-type(1)
      background linear-gradient(hsla(0, 0%, 100%, 0.25), hsla(0, 0%, 100%, 0.25)), url("https://assets.codepen.io/605876/avatar.png"), hsl(0, 0%, 98%)
      background-size 75%
      background-position center
      background-repeat no-repeat
      filter brightness(1) grayscale(1)

    &:nth-of-type(2):after
      content ''
      height 100%
      width 100%
      background hsla(0, 0%, 0%, 0.5)
      filter blur(var(--blur))
      position absolute
      top 10%
      left -5%

.window
  width calc((114 * var(--cm)) * 1vmin)
  background linear-gradient(40deg, transparent 20%, hsla(0, 0%, 100%, 0.5), transparent 50%), linear-gradient(40deg, transparent 50%, hsla(0, 0%, 100%, 0.25), transparent 60%), hsla(190, 80%, 90%, 0.25)
  height calc((95 * var(--cm)) * 1vmin)
  position absolute
  transform rotateX(90deg) translate3d(calc((22 * var(--cm)) * 1vmin), calc((102 * var(--cm)) * 1vmin), calc((18 * var(--cm)) * 1vmin))
  transform-origin 50% 0%

  &__frame
    &--top
    &--middle
    &--bottom
      --depth calc(4 * var(--cm))
      --width calc(115 * var(--cm))
      --height calc(4 * var(--cm))

      div
        background hsl(0, 0%, 98%)

        &:nth-of-type(6)
          background hsl(0, 0%, 90%)

    &--top
      bottom 0

    &--middle
      top 60%


    &--left
    &--right
      --depth calc(95 * var(--cm))
      --width calc(4 * var(--cm))
      --height calc(4 * var(--cm))

      div
        background hsl(0, 0%, 98%)

        &:nth-of-type(6)
          background hsl(0, 0%, 90%)

    &--right
      right 0

.jfdi
  --height calc(40 * var(--cm))
  --width calc(2 * var(--cm))
  --depth calc(60 * var(--cm))
  --y calc(90 * var(--cm))
  --x calc(var(--hang) * var(--cm))
  --z calc(190 * var(--cm))

  div
    background black

    &:nth-of-type(4):after
      content ''
      background hsla(0, 0%, 0%, 0.5)
      position absolute
      top 8%
      left 4%
      height 100%
      width 100%
      transition transform var(--transition)
      filter blur(var(--blur))

    &:nth-of-type(3)
      background hsl(0, 0%, 15%)

    &:nth-of-type(3):after
      transition color var(--transition)
      content 'JFDI'
      position absolute
      top 0
      left 0
      height 100%
      width 100%
      color hsl(0, 0%, 100%)
      font-weight bold
      font-family sans-serif
      font-size calc((22 * var(--cm)) * 1vmin)
      text-align center
      line-height calc((40 * var(--cm) * 1vmin))
              
            
!

JS

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

const CONTROLLER = new GUI()
const CONFIG = {
  'rotate-x': -24,
  'rotate-y': -40,
  hang: true,
}
const UPDATE = () => {
  Object.entries(CONFIG).forEach(([key, value]) => {
    document.documentElement.style.setProperty(`--${key}`, value)
  })
  document.documentElement.style.setProperty('--hang', CONFIG.hang ? 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, 'hang')
  .name('Offset canvas')
  .onChange(UPDATE)

UPDATE()

              
            
!
999px

Console