404 Concept Page @Property

404-concept-page-property.markdown

404 Concept Page @property

A Pen by Gwyneth Llewelyn on CodePen.

License.

index.pug

h1 404
.cloak__wrapper
  .cloak__container
    .cloak
.info
  h2 We can't find that page
  p.
    We're fairly sure that page used to be here, but seems to have gone missing. We do apologise on it's behalf.
  a(href="https://jhey.dev" target="_blank" rel="noreferrer noopener") Home

script.babel

// 404

style.stylus

@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@800&family=Roboto:wght@100;300&display=swap')

:root
  --button hsl(44, 0%, 70%)
  --button-color hsl(0, 0%, 4%)
  --shadow hsl(0, 0%, 0%)
  --bg hsl(53, 0%, 45%)
  --header hsl(53, 0%, 48%)
  --color hsl(0, 0%, 98%)
  --lit-header hsl(53, 0%, 90%)
  --speed 2s

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

@property --swing-x
  initial-value 0
  inherits false
  syntax '<integer>'
@property --swing-y
  initial-value 0
  inherits false
  syntax '<integer>'

body
  min-height 100vh
  display flex
  font-family 'Roboto', sans-serif
  flex-direction column
  align-items center
  justify-content center
  background var(--bg)
  color var(--color)
  perspective 1200px

a
  text-transform uppercase
  text-decoration none
  background var(--button)
  color var(--button-color)
  padding 1rem 4rem
  border-radius 4rem
  font-size 0.875rem
  letter-spacing 0.05rem

p
  font-weight 100

h1
  animation swing var(--speed) infinite alternate ease-in-out
  font-size clamp(5rem, 40vmin, 20rem)
  font-family 'Open Sans', sans-serif
  margin 0
  margin-bottom 1rem
  letter-spacing 1rem
  transform translate3d(0, 0, 0vmin)
  --x calc(50% + (var(--swing-x) * 0.5) * 1%)
  background radial-gradient(var(--lit-header), var(--header) 45%) var(--x) 100% / 200% 200%
  -webkit-background-clip text
  color transparent

  &:after
    animation swing var(--speed) infinite alternate ease-in-out
    content "404"
    position absolute
    top 0
    left 0
    color var(--shadow)
    filter blur(1.5vmin)
    transform scale(1.05) translate3d(0, 12%, -10vmin) translate(calc((var(--swing-x, 0) * 0.05) * 1%), calc((var(--swing-y) * 0.05) * 1%))

.cloak
  animation swing var(--speed) infinite alternate-reverse ease-in-out
  height 100%
  width 100%
  transform-origin 50% 30%
  transform rotate(calc(var(--swing-x) * -0.25deg))
  background radial-gradient(40% 40% at 50% 42%, transparent, black 35%)
  
  &__wrapper
    position fixed
    top 0
    left 0
    bottom 0
    right 0
    overflow hidden

  &__container
    height 250vmax
    width 250vmax
    position absolute
    top 50%
    left 50%
    transform translate(-50%, -50%)

.info
  text-align center
  line-height 1.5
  max-width clamp(16rem, 90vmin, 25rem)

  & > p
    margin-bottom 3rem

@keyframes swing
  0%
    --swing-x -100
    --swing-y -100
  50%
    --swing-y 0
  100%
    --swing-y -100
    --swing-x 100

Actually, this is just a fork.