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HTML

              
                .container
  label(for='let-the-dogs-out') Let the dogs out?
  input.let-the-dogs-out(type='checkbox', id='let-the-dogs-out')
  label.no-firefox Unfortunately, not in this browser 😭<br/> Maybe try Firefox to set them free!

  .dogmoji 🐶
  .yard
    .kennel
      .kennel__front
        .kennel__frame
          .kennel__door
            .dogs
              .dog 🐶
              .dog 🐶
              .dog 🐶
        .kennel__roof.kennel__roof--left
        .kennel__roof.kennel__roof--right
      - for(let i = 0; i < 15; i++)
        - let doge = Math.random() > 0.5 ? '🐕' : '🐩'
        .dog= doge


              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Lato')
*
  box-sizing border-box

body
  background-color #2eec71
  color            #fafafa
  text-align       center
  font-size        16px
  font-family      'Lato', sans-serif
  padding          2rem

random(ceiling)
  return floor(math(1, 'random')*ceiling)

limit = 40
@keyframes move
  0%, 100%
    transform translate(0, 0)
  25%
    transform translate((random(limit) - (limit / 2)) * 1%, (random(limit) - (limit / 2)) * 1%)
  50%
    transform translate((random(limit) - (limit / 2)) * 1%, (random(limit) - (limit / 2)) * 1%)
  75%
    transform translate((random(limit) - (limit / 2)) * 1%, (random(limit) - (limit / 2)) * 1%)

@keyframes move-flipped
  0%, 100%
    transform rotateY(180deg) translate(0, 0)
  25%
    transform rotateY(180deg) translate((random(limit) - (limit / 2)) * 1%, (random(limit) - (limit / 2)) * 1%)
  50%
    transform rotateY(180deg) translate((random(limit) - (limit / 2)) * 1%, (random(limit) - (limit / 2)) * 1%)
  75%
    transform rotateY(180deg) translate((random(limit) - (limit / 2)) * 1%, (random(limit) - (limit / 2)) * 1%)

@keyframes nod
  0, 100%
    transform translateY(0)
  50%
    transform translateY(25%)

@keyframes get-excited
  0, 100%
    transform translateY(0)
  50%
    transform translateY(-15px)

.container
  align-items center
  flex-direction column
  position relative
  text-align center

label
  font-size 2rem
  text-decoration line-through

.dogmoji
  font-size 2.5 rem
  margin-bottom 10px

.let-the-dogs-out
  height 25px
  width 25px
  &:hover
    & ~ .yard .dogs
      animation get-excited .15s infinite

  @supports (display: contents)
    &:checked
      & ~ .dogmoji
        animation nod .15s infinite
      & ~ .yard
        .kennel
          display contents
          &__front
            display none
          .dog
            animation-iteration-count infinite
            for dog in (1..20)
              &:nth-child({dog})
                if random(10) < 5
                  animation-name move
                else
                  animation-name move-flipped


.yard
  border 4px solid silver
  border-radius 5px
  background-color grey
  height 300px
  width  300px
  display flex
  flex-direction row
  flex-wrap wrap
  justify-content center
  align-items center
  margin 0 auto

.kennel
  display block
  height 150px
  width 150px
  overflow hidden
  position relative

  &__front
    height 150px
    width  150px
    display flex
    justify-content center
    align-items center
    animation rock 2s infinite alternate

  &__frame
    wood-color = #f3a32c
    slat-size = 20px
    background repeating-linear-gradient(180deg, wood-color, wood-color slat-size, darken(wood-color, 30%) slat-size, darken(wood-color, 30%) slat-size + 2px)
    clip-path polygon(0% 100%, 0 40%, 50% 0, 100% 40%, 100% 100%)
    height 120px
    position relative
    width 100px

  &__roof
    background-color #e74c3c
    height 10px
    left 50%
    position absolute
    top 10px
    width 90px

    &--left
      transform-origin left
      transform rotate(45deg) skewX(44deg)

    &--right
      transform-origin 0px
      transform rotate(135deg) skewX(-45deg)

  &__door
    border-radius 25px 25px 0 0
    height 70px
    width 60px
    background-color black
    position absolute
    bottom 0
    left 50%
    transform translateX(-50%)

    .dogs
      position absolute
      bottom 0
      left 50%
      width 60px
      margin-left -30px
      .dog
        position absolute
        font-size 4rem
        bottom 0
        left 50%
      .dog:nth-child(1)
        font-size 2.5rem
        transform translate(-50%, 0%)
      .dog:nth-child(2)
        font-size 1.5rem
        transform translate(-180%, 0%)
      .dog:nth-child(3)
        font-size 1.25rem
        transform translate(120%, 0%)

.dog
  display flex
  font-size 1.5rem
  width 20%
  justify-content center

  for dog in (1..16)
    &:nth-child({dog})
      animation-duration random(10) * .1s
      animation-delay random(10) * .1s

.no-firefox
  display block
  font-size 1.5rem
  text-decoration none

@supports (display: contents)
  .no-firefox
    display none
  label
    text-decoration none
              
            
!

JS

              
                // There is nothing to see here
              
            
!
999px

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