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HTML

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                - const randomInRange = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min
- const SECTIONS = ['HOME', 'ABOUT', 'CONTACT', 'WORK']
nav.menu(style=`--hue: ${Math.random() * 360}`)
  input(type='checkbox', id='menu-toggle', class='menu__toggle')
  label(for='menu-toggle', class='menu__toggle-label')
  label(for='menu-toggle', class='menu__toggle-label menu__toggle-label--closer')
    svg.menu__icon(preserveAspectRatio='xMinYMin', viewBox='0 0 24 24')
      path(d='M3,6H21V8H3V6M3,11H21V13H3V11M3,16H21V18H3V16Z')
    svg.menu__icon(preserveAspectRatio='xMinYMin', viewBox='0 0 24 24')
      path(d='M19,6.41L17.59,5L12,10.59L6.41,5L5,6.41L10.59,12L5,17.59L6.41,19L12,13.41L17.59,19L19,17.59L13.41,12L19,6.41Z')
  ul.menu__content
    li.menu__item(style=`--x: ${randomInRange(15, 35)}; --y: ${randomInRange(15, 25)};`)
      a.menu__link(href="#HOME") HOME
    li.menu__item(style=`--x: ${randomInRange(45, 75)}; --y: ${randomInRange(25, 40)};`)
      a.menu__link(href="#ABOUT") ABOUT
    li.menu__item(style=`--x: ${randomInRange(15, 35)}; --y: ${randomInRange(45, 75)};`)
      a.menu__link(href="#CONTACT") CONTACT
    li.menu__item(style=`--x: ${randomInRange(65, 75)}; --y: ${randomInRange(50, 75)};`)
      a.menu__link(href="#WORK") WORK
main
  for SECTION in SECTIONS
    section(id=SECTION)= SECTION
svg(style='position: absolute; left: 100%')
  defs
    filter(id=`goo`)
      feGaussianBlur(in='SourceGraphic', stdDeviation='15', result='BLUR')
      feColorMatrix(in='BLUR', mode='matrix', values='1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 18 -7', result='GOO')
      feBlend(in='SourceGraphic', in2=`goo`)
!

CSS 

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

:root
  --speed .85
  --primary hsl(0, 0, 100%)
  --size 30
  --ease cubic-bezier(0.175, 0.885, 0.32, 1.275)

body
  background #fafafa
  font-family 'Alata', sans-serif
  min-height 100vh
  overflow-x hidden
  padding 0

main
  height 100vh
  overflow-y scroll
  scroll-behavior smooth
  scroll-snap-type y mandatory

section
  align-items center
  display flex
  font-size 3rem
  height 100vh
  justify-content center
  scroll-snap-align center
  width 100vw

.menu
  position fixed

  &__toggle
    opacity 0
    position absolute

    &:checked
      & ~ .menu__content .menu__item
        --active-x var(--x)
        --active-y var(--y)
        --scale 1

      & ~ .menu__toggle-label:not(.menu__toggle-label--closer)
        --clip circle(1000% at 0% 0%)
        height 100vh
        width 100vw
        backdrop-filter blur(10px)

      & ~ .menu__toggle-label .menu__icon
        &:nth-of-type(1)
          --scale 0
        &:nth-of-type(2)
          --scale 1

  &__toggle-label
    cursor pointer
    height calc(var(--size, 20) * 0.5vmin)
    width calc(var(--size, 20) * 0.5vmin)
    display block
    --clip circle(100% at 0% 0%)
    -webkit-clip-path var(--clip)
    clip-path var(--clip)
    position absolute
    top 0
    left 0
    transition backdrop-filter calc(var(--speed, 1) * 1s) var(--ease), clip-path 0s, -webkit-clip-path 0s

    &--closer
      z-index 3
      --scale 0

  &__icon
    --scale 1
    height calc(var(--size, 20) * 0.25vmin)
    width calc(var(--size, 20) * 0.25vmin)
    position absolute
    top 50%
    left 50%
    transform translate(-70%, -70%) scale(var(--scale, 1))

    &:nth-of-type(2)
      --scale 0

    fill var(--primary)
    transition all calc(var(--speed, 1) * 1s) var(--ease)

  &__content
    background 'hsl(%s, 50%, 50%)' % var(--hue, 0)
    margin 0
    display block
    list-style-type none
    z-index -1
    filter url("#goo")
    position absolute
    top 0
    height 0
    width 0
    left 0
    z-index 2

    &:after
      background 'hsl(%s, 50%, 50%)' % var(--hue, 0)
      content ''
      border-radius 50%
      transform translate(-50%, -50%)
      position absolute
      height calc(var(--size, 20) * 1vmin)
      width calc(var(--size, 20) * 1vmin)
      top 0
      left 0

  &__item
    background 'hsl(%s, 50%, 50%)' % var(--hue, 0)
    border-radius 50%
    cursor pointer
    display flex
    list-style-type none
    font-size 1rem
    height calc(var(--size, 20) * 1vmin)
    left calc(var(--active-x, 0) * 1vw)
    overflow hidden
    place-items center
    position absolute
    text-align center
    top calc(var(--active-y, 0) * 1vh)
    transform translate(-50%, -50%) scale(var(--scale, 0.75))
    transition all calc(var(--speed, 1) * 1s) calc(var(--delay, 0) * 1s) var(--ease)
    width calc(var(--size, 20) * 1vmin)

    @media(min-width 768px)
      font-size 3rem

    &:nth-of-type(1)
      --delay .1
      --x 35
      --y 35
    &:nth-of-type(2)
      --delay .2
      --x 65
      --y 35
    &:nth-of-type(3)
      --delay .3
      --x 35
      --y 65
    &:nth-of-type(4)
      --delay .4
      --x 65
      --y 65

  &__link
    align-items center
    color white
    cursor pointer
    text-decoration none
    font-weight bold
    text-align center
    display flex
    justify-content center
    height 100%
    width 100%

    &:hover
      text-decoration underline
!

JS 

              
                // 404
!
999px

Console