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HTML

              
                mixin balloon()
  svg.balloon(xmlns='http://www.w3.org/2000/svg' viewbox='0 0 117.9 124.8' style=`--s: ${Math.random() * 10 + 2}; --d: ${Math.random() * -10};`)
    path.balloon__string(d='M59 121v170' stroke-width='2.4')
    path.balloon__body(d='M59 0A59 59 0 000 59a59 59 0 0050 58 6 6 0 005 8h7a6 6 0 006-8 59 59 0 0050-58A59 59 0 0059 0z')
    path.balloon__glare(d='M14 42a45 45 0 0127-26' stroke-width='7.9' stroke-linecap='round' stroke-linejoin='round')
    path.balloon__shadow(d='M59 0a59 59 0 00-5 0 59 59 0 0157 59 59 59 0 01-58 59 59 59 0 01-3 0v1c0 3 2 6 5 6h7a6 6 0 006-8 59 59 0 0050-58A59 59 0 0059 0zm-5 0a59 59 0 00-6 1 59 59 0 016-1zm-6 1a59 59 0 00-6 2 59 59 0 016-2zm-6 2zm0 0a59 59 0 00-5 1 59 59 0 015-1zm-5 1a59 59 0 00-1 1 59 59 0 011-1zm-1 1a59 59 0 00-5 2 59 59 0 015-2zm-5 2zm0 0a59 59 0 00-5 3 59 59 0 015-3zm-5 3zm0 0a59 59 0 00-4 3 59 59 0 014-3zm-4 3a59 59 0 00-1 1 59 59 0 011-1zm-1 1a59 59 0 00-3 3 59 59 0 013-3zm-3 3a59 59 0 00-1 1 59 59 0 011-1zm-1 1a59 59 0 00-3 3 59 59 0 013-3zm-3 3a59 59 0 00-1 1 59 59 0 011-1zm-1 1a59 59 0 00-3 4 59 59 0 013-4zm-3 4a59 59 0 000 1 59 59 0 010-1zm0 1a59 59 0 00-3 4 59 59 0 013-4zm-3 4a59 59 0 000 1 59 59 0 010-1zm0 1a59 59 0 00-2 4 59 59 0 012-4zm-2 4a59 59 0 00-1 1 59 59 0 011-1zm-1 1a59 59 0 00-1 4 59 59 0 011-4zm-1 4a59 59 0 00-1 2 59 59 0 011-2zm-1 2a59 59 0 00-1 3 59 59 0 011-3zm-1 3a59 59 0 000 3 59 59 0 010-3zm0 3a59 59 0 00-1 3 59 59 0 011-3zm-1 3a59 59 0 000 3 59 59 0 010-3zm0 3a59 59 0 000 4 59 59 0 010-4z')

mixin cake(face, candles)
  svg.cake(class!=attributes.class xmlns='http://www.w3.org/2000/svg' viewBox='0 0 105.8 45.4' preserveAspectRatio="none")
    path.cake__body(d='M0 0h106v45H0z')
    path.cake__frosting(d='M1-8h104c4 0 8 4 8 9s-4 8-8 9c-5 0-8-8-13-8s-8 8-13 8-8-8-13-8-8 8-13 8-8-8-13-8-8 8-13 8-8-8-13-8-8 8-13 8c-4-1-8-4-8-9s3-9 8-9z' fill='purple')
    if (face)
      g.cake__face
        g.cake__eyes
          g(transform='translate(-8 -237)')
            circle(cx='38.6' cy='259.2' r='4.5')
            circle(cx='36.3' cy='257.1' r='.8' fill='#fff')
          g(transform='translate(37 -237)')
            circle(r='4.5' cy='259.2' cx='38.6')
            circle(r='.8' cy='257.1' cx='36.3' fill='#fff')
        g.cake__mouth
          path(d='M57 25a4 4 0 11-8 0')
          path(d='M55 26a3 3 0 00-3 2 4 4 0 004-1 3 3 0 00-1-1z' fill='red')
        g.cake__cheeks(transform='translate(-13 -237)' fill='#ffd5d5')
          circle(r='3.7' cy='265.5' cx='28.6')
          circle(cx='102.9' cy='265.5' r='3.7')
    if (candles)
      g.cake__candle
        g(transform='translate(-13 -238)')
          rect.candle__body(ry='0' y='212.2' x='34.2' height='21.8' width='6.8')
          path.candle__stripes(d='M34 224v3l7 7v-3zM34 218v4l7 6v-3zM34 212v4l7 7v-4z')
        g.candle__flame
          path.candle__flame-outer(d='M29-30a4 4 0 01-8 0c0-2 4-2 4-7s4 5 4 7z')
          path.candle__flame-inner(d='M27-29a2 2 0 01-4-1c0-1 2-1 2-3 1-2 2 3 2 4z')
      g.cake__candle
        g(transform='translate(43 -238)')
          rect.candle__body(width='6.8' height='21.8' x='34.2' y='212.2' ry='0')
          path.candle__stripes(d='M34 224v3l7 7v-3zM34 218v4l7 6v-3zM34 212v4l7 7v-4z')
        g.candle__flame
          path.candle__flame-outer(d='M85-29a4 4 0 01-8 0c0-3 4-3 4-7 0-6 4 4 4 7z')
          path.candle__flame-inner(d='M83-29a2 2 0 01-4-1c0-1 2 0 2-3 1-2 2 3 2 4z')
      g.cake__candle
        g(transform='translate(15 -232)')
          rect.candle__body(width='6.8' height='21.8' x='34.2' y='212.2' ry='0')
          path.candle__stripes(d='M34 224v3l7 7v-3zM34 218v4l7 6v-3zM34 212v4l7 7v-4z')
        g.candle__flame
          path.candle__flame-outer(d='M57-24a4 4 0 01-8 0c0-2 4-2 4-7s4 5 4 7z')
          path.candle__flame-inner(d='M55-24a2 2 0 01-4 0c0-1 2-1 2-3 1-2 2 2 2 3z')
    g.cake__sprinkles
      g(transform='translate(-10 -237)')
        rect.cake__sprinkle(style=`--hue: ${Math.random() * 359}` transform='rotate(39)' ry='1.2' y='199.6' x='185.8' height='6.3' width='2.4')
        rect.cake__sprinkle(style=`--hue: ${Math.random() * 359}` width='2.4' height='6.3' x='-141.5' y='236.8' ry='1.2' transform='rotate(-36)')
        rect.cake__sprinkle(style=`--hue: ${Math.random() * 359}` transform='rotate(-72)' ry='1.2' y='185.1' x='-231.3' height='6.3' width='2.4')
        rect.cake__sprinkle(style=`--hue: ${Math.random() * 359}` width='2.4' height='6.3' x='220' y='190.4' ry='1.2' transform='rotate(30)')
        rect.cake__sprinkle(style=`--hue: ${Math.random() * 359}` transform='rotate(46)' ry='1.2' y='128.8' x='257.6' height='6.3' width='2.4')
        rect.cake__sprinkle(style=`--hue: ${Math.random() * 359}` width='2.4' height='6.3' x='-186.3' y='216.6' ry='1.2' transform='rotate(-56)')
        rect.cake__sprinkle(style=`--hue: ${Math.random() * 359}` transform='rotate(30)' ry='1.2' y='212.4' x='178.7' height='6.3' width='2.4')
        rect.cake__sprinkle(style=`--hue: ${Math.random() * 359}` width='2.4' height='6.3' x='-191.8' y='199.2' ry='1.2' transform='rotate(-51)')
        rect.cake__sprinkle(style=`--hue: ${Math.random() * 359}` transform='rotate(77)' ry='1.2' y='-7.4' x='284.7' height='6.3' width='2.4')
        rect.cake__sprinkle(style=`--hue: ${Math.random() * 359}` width='2.4' height='6.3' x='-218.9' y='174.7' ry='1.2' transform='rotate(-63)')

input#read(type="checkbox")
label(for="read") Read Card
.scene
  .card
    - let c = 0
    while c < 50
      .card__confetti(style=`--rx: ${Math.random() * 360}; --ry: ${Math.random() * 360}; --a: ${Math.random() * 90}; --hue: ${Math.random() * 360}; --r: ${Math.random() * 180 - 90}; --s:${Math.random() * 5}; --sk: ${Math.random() * 20};`)
      - c++
    .card__outer.card__part.flip
      .flip__piece.flip__piece--front.section
        .section__piece.section__piece--front.front-cover.front-cover__front
        .section__piece.section__piece--rear.front-cover.hide-back
          .cover__content.cover__content--front.hide-back
            h1.message.hide-back
              span Happy
              span Birthday!
            +balloon()
            +balloon()
            +balloon()
      .flip__piece.flip__piece--back.section
        .section__piece.section__piece--front.rear-cover.rear-cover__front
        .section__piece.section__piece--back.hide-back
          .cover__content.cover__content--rear
            .barcode
            img.stamp(src="https://assets.codepen.io/605876/avatar.png" alt="jh3y avatar")
    .card__inner.card__part.flip
      .flip__piece.flip__piece--front.section
        .section__piece.section__piece--back.inner-top
          .card__content-container.card__content-container--inner-top
            .card__content.card__content--top
              .cake__section.cake__section--bottom.cake__section--bottom-top
                .cake__section.cake__section--mid-top.cake__section--mid
                  .cake__section.cake__section--top-top.cake__section--top
                  .cake__section.cake__section--top-front.cake__section--top
                    +cake(false, true)(class="cake--top")
                .cake__section.cake__section--mid-front.cake__section--mid
                  +cake(false, false)(class="cake--mid")
      .flip__piece.flip__piece--back.section
        .section__piece.section__piece--front.inner-bottom
          .card__content-container.card__content-container--inner-bottom
            .card__content.card__content--bottom
              .cake__section.cake__section--bottom-front.cake__section--bottom
                +cake(true, false)(class="cake--bottom")
              h2.card__message Eat some cake!
svg
  filter#scribble--0
    feturbulence(basefrequency='0.02', numoctaves='3', result='noise', seed='0')
    fedisplacementmap#displacement(in='SourceGraphic', in2='noise', scale='2')
  filter#scribble--1
    feturbulence(basefrequency='0.02', numoctaves='3', result='noise', seed='1')
    fedisplacementmap(in='SourceGraphic', in2='noise', scale='3')
  filter#scribble--2
    feturbulence(basefrequency='0.02', numoctaves='3', result='noise', seed='2')
    fedisplacementmap(in='SourceGraphic', in2='noise', scale='2')
  filter#scribble--3
    feturbulence(basefrequency='0.02', numoctaves='3', result='noise', seed='3')
    fedisplacementmap(in='SourceGraphic', in2='noise', scale='3')
  filter#scribble--4
    feturbulence(basefrequency='0.02', numoctaves='3', result='noise', seed='4')
    fedisplacementmap(in='SourceGraphic', in2='noise', scale='2')
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css2?family=Fredoka+One&display=swap')
*
  box-sizing border-box
  // transform-style preserve-3d


:root
  --bg hsl(210, 32%, 24%)
  --body hsl(0, 0%, 100%)
  --stripes hsl(10, 80%, 80%)
  --flame-1 hsl(30, 80%, 60%)
  --flame-2 hsl(45, 90%, 80%)
  --paper hsl(210, 80%, 85%)
  --paper-2 hsl(210, 80%, 95%)
  --paper-3 hsl(210, 80%, 60%)
  --card hsl(0, 0%, 98%)
  --insert hsl(210, 80%, 85%)
  --bottom-frosting hsl(10, 80%, 80%)
  --mid-frosting hsl(180, 80%, 80%)
  --top-frosting hsl(90, 80%, 80%)
  --balloon-3 10
  --balloon-2 180
  --balloon-1 90
  --size 35vmin
  --height var(--size)
  --width calc(var(--size) * 1.4)
  --read 0
  --transition 0.2s

body
  background var(--bg)
  min-height 100vh
  perspective 1000px
  transform-style preserve-3d
  overflow hidden

input
  opacity 0
  position fixed
  right 100%

label
  height 100vh
  width 100vw
  position fixed
  top 0
  left 0
  z-index 2
  transform-style preserve-3d
  transform translate3d(0, 0, 100px)

:checked ~ .scene
  --read 1

  .hide-back
    -webkit-backface-visibility hidden
    backface-visibility hidden

  .cake__candle
    transform translate(0, 0)

.stamp
  height 8vmin
  position absolute
  top 50%
  left 50%
  transform translate3d(-50%, -50%, 1px)
  filter saturate(0.5)

.barcode
  height 6vmin
  width 8vmin
  position absolute
  bottom 2vmin
  right 2vmin
  transform translate3d(0, 0, 1px)
  --l hsl(0, 0%, 50%)
  background repeating-linear-gradient(90deg, var(--l) 0 1%, transparent 1% 2%, var(--l) 2% 4%, transparent 4% 5%, var(--l) 5% 10%)

.scene
  display flex
  align-items center
  justify-content center
  transform rotateY(calc(var(--x, 0) * 1deg)) rotateX(calc(var(--y, 0) * 1deg))
  height 100vh
  width 100vw
  transform-style preserve-3d

.card
  height calc(var(--height))
  position relative
  width var(--width)
  transform-style preserve-3d
  transform translate(0, calc(var(--read, 0) * 25%)) rotateX(calc(var(--read, 0) * 90deg))
  transition transform var(--transition)

  &__confetti
    --size calc(var(--s) * 1vmin)
    height var(--size)
    width var(--size)
    position absolute
    top 0%
    left 50%
    transition transform calc(var(--read) * var(--transition)) calc(var(--read) * var(--transition)), opacity calc(var(--read) * var(--transition)) calc((var(--read) * var(--transition)) * 2)
    transform scale(var(--read)) translate(-50%, 10%) rotate(calc(var(--r) * 1deg)) rotateX(calc(var(--a) * 1deg)) skew(calc(var(--sk) * 1deg)) translate(0, calc(var(--height) * (var(--read, 0) * 1.5)))
    opacity calc(1 - var(--read))

    &:after
      background 'hsl(%s, 80%, 80%)' % var(--hue)
      content ''
      position absolute
      height 100%
      width 100%
      transition transform calc(var(--read) * var(--transition)) calc(var(--read) * var(--transition))
      transform rotateX(calc((var(--rx) * var(--read)) * 1deg)) rotateY(calc((var(--ry) * var(--read)) * 1deg))

  &__content
    transform-style preserve-3d
    height 100%
    width 100%
    &--bottom
      // transform-style preserve-3d
      &:before
        content ""
        position absolute
        top 0
        left 0
        height 100%
        width 100%
        background var(--insert)
        $clip = polygon(0 0, 15% 0, 15% 30%, 85% 30%, 85% 0, 100% 0, 100% 100%, 0 100%)
        -webkit-clip-path $clip
        clip-path $clip
    &--top
      // transform-style preserve-3d
      &:before
        content ""
        position absolute
        top 0
        left 0
        height 100%
        width 100%
        background var(--insert)
        $clip = polygon(0 0, 100% 0, 100% 100%, 85% 100%, 85% 70%, 78% 70%, 78% 46%, 72.4% 46%, 72.4% 26.8%, 27.6% 26.8%, 27.6% 46%, 22% 46%, 22% 70%, 15% 70%, 15% 100%, 0 100%)
        -webkit-clip-path $clip
        clip-path $clip

  &__message
    position absolute
    padding 1rem
    font-family sans-serif
    bottom 0
    left 50%
    transform translate(-50%, 0)

  &__part
    height var(--h, 100%)
    width var(--w, 100%)
    position absolute
    top 0%
    left 50%
    transform translate(-50%, 0)
    transform-style preserve-3d

  &__inner
    --h 96%
    --w 95%
    transform translate3d(-50%, 0, calc(var(--height) * 0))

  &__sleeve
    height 100%
    width 100%

.message
  font-family "Fredoka One", cursive
  color hsl(0, 0%, 10%)
  display flex
  flex-direction column
  position absolute
  top 50%
  left 20%
  transform translate3d(0, -50%, 0)
  margin 0
  font-size 4.5vmin

.card__message
  font-family "Fredoka One", cursive
  color hsl(0, 0%, 10%)
  font-size 4vmin
  white-space nowrap
  position absolute
  top 50%
  left 50%
  transform translate(-50%, 0)

.flip
  transform-style preserve-3d

  &__piece
    height 100%
    position absolute
    width 100%
    transform-origin 50% 0
    transform-style preserve-3d
    transition transform var(--transition)

    &--front
      transform rotateX(calc(var(--front) * 1deg))
    &--back
      transform rotateX(calc(var(--rear) * 1deg))

.card__inner
  // Either 1.75 or 89.75
  --rear calc(-1.75 + (var(--read, 0) * 2))
  --front calc(1.75 + (var(--read, 0) * 88))

.card__outer
  --rear calc(-2 + (var(--read, 0) * 2))
  --front calc(2 + (var(--read, 0) * 88))

.card__content-container
  transform-style preserve-3d
  height 100%
  width 100%
  top 0
  left 0
  position absolute
  &--inner-top
    transform rotate(180deg) translate3d(0, 0, 0)
  &--inner-bottom
    transform translate3d(0, 0, 0)

.cover__content
  height 100%
  width 100%
  background var(--card)
  position absolute
  font-size 2vmin
  transform-style preserve-3d

  &--front
  &--rear
    transform translate3d(0, 0, 1px)

.front-cover__front
.rear-cover__front
  background var(--card)

.front-cover__front:after
.rear-cover__front:after
  content ''
  position absolute
  top 0%
  left 50%
  transform translate3d(-50%, 0, 0px)
  background var(--paper-3)
  height 95%
  width 95%
.rear-cover__front:after
  transform translate(-50%, 0, 2px)

.cake__section
  position absolute
  transform-style preserve-3d
  transition var(--transition)

  &--top
    height 80%
    width 80%
    left 50%
    bottom 0

    &-top
      transform translate(-50%, 0) rotateX(calc(var(--read, 0) * 90deg)) translate3d(0, -100%, calc(var(--read, 0) * 0px)) rotateX(calc(var(--read, 0) * -90deg))
      transform-origin 50% 100%
      background var(--paper)
    &-front
      background var(--paper-2)
      transform-origin 50% 100%
      transform translate(-50%, -100%) rotateX(calc(var(--read, 0) * 90deg))

  &--mid
    height 80%
    width 80%
    left 50%

    &-front
      bottom 0
      transform-origin 50% 0
      transform translate3d(-50%, 0, 0) rotateX(calc((180 - (var(--read, 0) * -90)) * 1deg))
      background var(--paper-2)

    &-top
      background transparent
      bottom 0
      transform-origin 50% 100%
      transform translate(-50%, 0) rotateX(calc(var(--read, 0) * 90deg)) translate3d(0, -100%, calc(var(--read, 0) * 0px)) rotateX(calc(var(--read, 0) * -90deg))

      &:before
        content ''
        position absolute
        height 100%
        width 100%
        $clip = polygon(0 0, 10% 0, 10% 80%, 90% 80%, 90% 0, 100% 0, 100% 100%, 0 100%)
        -webkit-clip-path $clip
        clip-path $clip
        transform rotate(180deg)
        background var(--paper)

  &--bottom
    height 30%
    width 70%
    left 50%
    transition var(--transition)

    &-top
      background transparent
      transform-origin 50% 100%
      bottom 0
      transform translate(-50%, -100%) rotateX(calc(var(--read, 0) * -90deg))

      &:before
        content ''
        position absolute
        height 100%
        width 100%
        $clip = polygon(0 0, 10% 0, 10% 80%, 90% 80%, 90% 0, 100% 0, 100% 100%, 0 100%)
        -webkit-clip-path $clip
        clip-path $clip
        transform rotate(180deg)
        background var(--paper)

    &-front
      background var(--paper-2)
      top 0
      transform-origin 50% 0
      transform translate(-50%, 100%) rotateX(calc(var(--read, 0) * 90deg))

.section
  height 100%
  width 100%

  &__piece
    position absolute
    height 100%
    width 100%
    transform-style preserve-3d

    &--back
      transform rotateY(180deg)

.balloon
  overflow visible !important
  height 6vmin
  position absolute
  left calc(var(--x, 0) * 1%)
  top calc(var(--y, 0) * 1%)
  animation float calc(var(--s, 0) * 1s) calc(var(--d, 0) * 1s) infinite

  &__body
    fill 'hsla(%s, 80%, 50%, 0.75)' % var(--hue, 0)

  &__glare
    fill hsla(0, 0%, 100%, 0.75)

  &__shadow
    fill 'hsla(%s, 80%, 30%, 0.75)' % var(--hue, 0)

  &__string
    stroke hsl(40, 40%, 50%)

  &:nth-of-type(1)
    --hue var(--balloon-1)
    --x 58
    --y 28
  &:nth-of-type(2)
    --hue var(--balloon-2)
    --x 68
    --y 20
  &:nth-of-type(3)
    --hue var(--balloon-3)
    --x 65
    --y 40

.cake
  overflow visible !important
  width 100%
  height 100%
  transform translate3d(0, 0, 1px)

  &__frosting
    fill var(--frosting)

  &__eyes
    transform-origin 50% 24px
    animation blink 5s infinite

  &__body
    fill var(--body)

  &--bottom
    --frosting var(--bottom-frosting)
  &--mid
    --frosting var(--mid-frosting)
  &--top
    --frosting var(--top-frosting)

  &--bottom
  &--mid
    transform translate3d(0, 0, -1px) rotate(180deg)

  &--mid
  &--top
    .cake__sprinkles
      transform translate(0, -8px)

  &__candle
    transform translate(0, 12px)
    transition var(--transition)


  &__sprinkle
    fill 'hsl(%s, 80%, 70%)' % var(--hue)

.candle
  &__body
    fill var(--body)
  &__stripes
    fill var(--stripes)
  &__flame
    animation scribble 0.5s infinite
  &__flame-outer
    fill var(--flame-1)
  &__flame-inner
    fill var(--flame-2)

@keyframes blink
  0%, 47%, 49%, 51%, 100%
    transform scaleY(1)
  48%, 50%
    transform scaleY(0.1)


@keyframes float
  0%, 100%
    transform translate3d(0, 0, calc(var(--s) * 1px))
  50%
    transform translate3d(0, -25%, calc(var(--s) * 1px))

@keyframes scribble
  0%
    filter url('#scribble--0')
  25%
    filter url('#scribble--1')
  50%
    filter url('#scribble--2')
  75%
    filter url('#scribble--3')
  100%
    filter url('#scribble--4')
              
            
!

JS

              
                const mapRange = (a1, a2, b1, b2, value) => {
  const inRange = a2 - a1
  const outRange = b2 - b1
  const func = v => b1 + (((v - a1) / inRange) * outRange || 0)
  return value || value === 0 ? func(value) : func
}

const BOUNDS = 90
const UPDATE = ({ x: pointerX, y: pointerY }) => {
  const x = mapRange(0, window.innerWidth, -BOUNDS, BOUNDS, pointerX)
  const y = mapRange(0, window.innerHeight, BOUNDS, -BOUNDS, pointerY)
  document.documentElement.style.setProperty('--x', x)
  document.documentElement.style.setProperty('--y', y)
}
const CHEER = new Audio('https://assets.codepen.io/605876/kids-cheering.mp3')
CHEER.volume = 0.5
const INPUT = document.querySelector('input')
INPUT.addEventListener('change', () => {
  if (INPUT.checked) {
    CHEER.currentTime = 0
    CHEER.play()
  }
})

window.addEventListener('pointermove', UPDATE)

              
            
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999px

Console