you can scroll.

index.html

<header>
      <h1 class="fluid">you deserve<br />more.</h1>
    </header>
    <main>
      <section class="content fluid">
        <h2><span aria-hidden="true">you can&nbsp;</span>
          <span class="sr-only">you can ship things.</span>
        </h2>
        <ul aria-hidden="true" style="--count: 22">
          <li style="--i: 0">optimize.</li>
          <li style="--i: 1">save.</li>
          <li style="--i: 2">invest.</li>
          <li style="--i: 3">plan.</li>
          <li style="--i: 4">maximize.</li>
          <li style="--i: 5">reduce.</li>
          <li style="--i: 6">track.</li>
          <li style="--i: 7">analyze.</li>
          <li style="--i: 8">claim.</li>
          <li style="--i: 9">calculate.</li>
          <li style="--i: 10">exempt.</li>
          <li style="--i: 11">optimize deductions.</li>
          <li style="--i: 12">file returns.</li>
          <li style="--i: 13">forecast taxes.</li>
          <li style="--i: 14">benefit.</li>
          <li style="--i: 15">assess.</li>
          <li style="--i: 16">consult.</li>
          <li style="--i: 17">grow.</li>
          <li style="--i: 18">secure.</li>
          <li style="--i: 19">retire smarter.</li>
          <li style="--i: 20">achieve.</li>
          <li style="--i: 21">win.</li>
        </ul>
      </section>
      <section>
        <h2 class="fluid">savetax.ai</h2>
      </section>
    </main>
    <footer>@savetax-ai &copy; 2025</footer>
    

script.babel

import { Pane } from 'https://cdn.skypack.dev/[email protected]'
import gsap from 'https://cdn.skypack.dev/[email protected]'
import ScrollTrigger from 'https://cdn.skypack.dev/[email protected]/ScrollTrigger'

const config = {
  theme: 'dark',
  animate: true,
  snap: true,
  start: gsap.utils.random(0, 100, 1),
  end: gsap.utils.random(900, 1000, 1),
  scroll: true,
  debug: false,
}

const ctrl = new Pane({
  title: 'Config',
  expanded: false,
})

let items
let scrollerScrub
let dimmerScrub
let chromaEntry
let chromaExit

const update = () => {
  document.documentElement.dataset.theme = config.theme
  document.documentElement.dataset.syncScrollbar = config.scroll
  document.documentElement.dataset.animate = config.animate
  document.documentElement.dataset.snap = config.snap
  document.documentElement.dataset.debug = config.debug
  document.documentElement.style.setProperty('--start', config.start)
  document.documentElement.style.setProperty('--hue', config.start)
  document.documentElement.style.setProperty('--end', config.end)

  if (!config.animate) {
    chromaEntry?.scrollTrigger.disable(true, false)
    chromaExit?.scrollTrigger.disable(true, false)
    dimmerScrub?.disable(true, false)
    scrollerScrub?.disable(true, false)
    gsap.set(items, { opacity: 1 })
    gsap.set(document.documentElement, { '--chroma': 0 })
  } else {
    gsap.set(items, { opacity: (i) => (i !== 0 ? 0.2 : 1) })
    dimmerScrub.enable(true, true)
    scrollerScrub.enable(true, true)
    chromaEntry.scrollTrigger.enable(true, true)
    chromaExit.scrollTrigger.enable(true, true)
  }
}

const sync = (event) => {
  if (
    !document.startViewTransition ||
    event.target.controller.view.labelElement.innerText !== 'Theme'
  )
    return update()
  document.startViewTransition(() => update())
}
ctrl.addBinding(config, 'animate', {
  label: 'Animate',
})
ctrl.addBinding(config, 'snap', {
  label: 'Snap',
})
ctrl.addBinding(config, 'start', {
  label: 'Hue Start',
  min: 0,
  max: 1000,
  step: 1,
})
ctrl.addBinding(config, 'end', {
  label: 'Hue End',
  min: 0,
  max: 1000,
  step: 1,
})
ctrl.addBinding(config, 'scroll', {
  label: 'Scrollbar',
})
ctrl.addBinding(config, 'debug', {
  label: 'Debug',
})

ctrl.addBinding(config, 'theme', {
  label: 'Theme',
  options: {
    System: 'system',
    Light: 'light',
    Dark: 'dark',
  },
})

ctrl.on('change', sync)

// backfill the scroll functionality with GSAP
if (
  !CSS.supports('(animation-timeline: scroll()) and (animation-range: 0% 100%)')
) {
  gsap.registerPlugin(ScrollTrigger)

  // animate the items with GSAP if there's no CSS support
  items = gsap.utils.toArray('ul li')

  gsap.set(items, { opacity: (i) => (i !== 0 ? 0.2 : 1) })

  const dimmer = gsap
    .timeline()
    .to(items.slice(1), {
      opacity: 1,
      stagger: 0.5,
    })
    .to(
      items.slice(0, items.length - 1),
      {
        opacity: 0.2,
        stagger: 0.5,
      },
      0
    )

  dimmerScrub = ScrollTrigger.create({
    trigger: items[0],
    endTrigger: items[items.length - 1],
    start: 'center center',
    end: 'center center',
    animation: dimmer,
    scrub: 0.2,
  })

  // register scrollbar changer
  const scroller = gsap.timeline().fromTo(
    document.documentElement,
    {
      '--hue': config.start,
    },
    {
      '--hue': config.end,
      ease: 'none',
    }
  )

  scrollerScrub = ScrollTrigger.create({
    trigger: items[0],
    endTrigger: items[items.length - 1],
    start: 'center center',
    end: 'center center',
    animation: scroller,
    scrub: 0.2,
  })

  chromaEntry = gsap.fromTo(
    document.documentElement,
    {
      '--chroma': 0,
    },
    {
      '--chroma': 0.3,
      ease: 'none',
      scrollTrigger: {
        scrub: 0.2,
        trigger: items[0],
        start: 'center center+=40',
        end: 'center center',
      },
    }
  )
  chromaExit = gsap.fromTo(
    document.documentElement,
    {
      '--chroma': 0.3,
    },
    {
      '--chroma': 0,
      ease: 'none',
      scrollTrigger: {
        scrub: 0.2,
        trigger: items[items.length - 2],
        start: 'center center',
        end: 'center center-=40',
      },
    }
  )
}
// run it
update()

style.css

@import url('https://fonts.googleapis.com/css2?family=Geist:[email protected]&display=swap');
@import url('https://unpkg.com/normalize.css') layer(normalize);

@layer normalize, base, demo, stick, effect, srollbar, debug;

@layer debug {
  [data-debug='true'] li {
    outline: 0.05em dashed currentColor;
  }
  [data-debug='true'] :is(h2, li:last-of-type) {
    outline: 0.05em dashed canvasText;
  }
}

@layer scrollbar {
  @property --hue {
    initial-value: 0;
    syntax: '<number>';
    inherits: false;
  }
  @property --chroma {
    initial-value: 0;
    syntax: '<number>';
    inherits: true;
  }

  [data-sync-scrollbar='true'] {
    scrollbar-color: oklch(var(--lightness) var(--chroma) var(--hue)) #0000;
  }
  @supports (animation-timeline: scroll()) and (animation-range: 0% 100%) {
    [data-sync-scrollbar='true'][data-animate='true'] {
      timeline-scope: --list;
      scrollbar-color: oklch(var(--lightness) var(--chroma, 0) var(--hue)) #0000;
      animation-name: change, chroma-on, chroma-off;
      animation-fill-mode: both;
      animation-timing-function: linear;
      /* animation-timeline: scroll(root); */
      animation-range: entry 50% exit 50%, entry 40% entry 50%,
        exit 30% exit 40%;
      animation-timeline: --list;
      ul {
        view-timeline: --list;
      }
    }
  }

  @keyframes change {
    to {
      --hue: var(--end);
    }
  }
  @keyframes chroma-on {
    to {
      --chroma: 0.3;
    }
  }
  @keyframes chroma-off {
    to {
      --chroma: 0;
    }
  }
}

@layer effect {
  :root {
    --start: 0;
    --end: 360;
    --lightness: 65%;
    --base-chroma: 0.3;
  }
  [data-theme='dark'] {
    --lightness: 75%;
  }
  [data-theme='light'] {
    --lightness: 65%;
  }
  @media (prefers-color-scheme: dark) {
    --lightness: 75%;
  }
  ul {
    --step: calc((var(--end) - var(--start)) / (var(--count) - 1));
  }
  li:not(:last-of-type) {
    color: oklch(
      var(--lightness) var(--base-chroma)
        calc(var(--start) + (var(--step) * var(--i)))
    );
  }

  @supports (animation-timeline: scroll()) and (animation-range: 0% 100%) {
    [data-animate='true'] {
      li {
        opacity: 0.2;
        animation-name: brighten;

        &:first-of-type {
          --start-opacity: 1;
        }
        &:last-of-type {
          --brightness: 1;
          --end-opacity: 1;
        }
        animation-fill-mode: both;
        animation-timing-function: linear;
        animation-range: cover calc(50% - 1lh) calc(50% + 1lh);
        animation-timeline: view();
      }
    }

    @keyframes brighten {
      0% {
        opacity: var(--start-opacity, 0.2);
      }
      50% {
        opacity: 1;
        filter: brightness(var(--brightness, 1.2));
      }
      100% {
        opacity: var(--end-opacity, 0.2);
      }
    }
  }
}

@layer stick {
  section:first-of-type {
    --font-level: 6;
    display: flex;
    line-height: 1.25;
    width: 100%;
    padding-left: 5rem;
  }
  section:last-of-type {
    min-height: 100vh;
    display: flex;
    place-items: center;
    width: 100%;
    justify-content: center;

    h2 {
      --font-level: 6;
    }
  }
  main {
    width: 100%;
  }
  section:first-of-type h2 {
    position: sticky;
    top: calc(50% - 0.5lh);
    font-size: inherit;
    margin: 0;
    display: inline-block;
    height: fit-content;
    font-weight: 600;
  }
  ul {
    font-weight: 600;
    padding-inline: 0;
    margin: 0;
    list-style-type: none;
  }

  [data-snap='true'] {
    scroll-snap-type: y proximity;

    li {
      scroll-snap-align: center;
    }
  }

  h2,
  li:last-of-type {
    background: linear-gradient(
      canvasText 50%,
      color-mix(in oklch, canvas, canvasText 25%)
    );
    background-clip: text;
    color: #0000;
  }
}

@layer demo {
  header {
    min-height: 100vh;
    display: flex;
    place-items: center;
    width: 100%;
    padding-inline: 5rem;
  }

  footer {
    padding-block: 2rem;
    opacity: 0.5;
  }

  h1 {
    --font-size-min: 24;
    --font-level: 8;
    text-wrap: pretty;
    line-height: 0.8;
    margin: 0;
    background: linear-gradient(
      canvasText 60%,
      color-mix(in oklch, canvas, canvasText)
    );
    background-clip: text;
    color: #0000;
  }
}

@layer base {
  :root {
    --font-size-min: 14;
    --font-size-max: 20;
    --font-ratio-min: 1.1;
    --font-ratio-max: 1.33;
    --font-width-min: 375;
    --font-width-max: 1500;
  }

  html {
    color-scheme: light dark;
  }

  [data-theme='light'] {
    color-scheme: light only;
  }

  [data-theme='dark'] {
    color-scheme: dark only;
  }

  :where(.fluid) {
    --fluid-min: calc(
      var(--font-size-min) * pow(var(--font-ratio-min), var(--font-level, 0))
    );
    --fluid-max: calc(
      var(--font-size-max) * pow(var(--font-ratio-max), var(--font-level, 0))
    );
    --fluid-preferred: calc(
      (var(--fluid-max) - var(--fluid-min)) /
        (var(--font-width-max) - var(--font-width-min))
    );
    --fluid-type: clamp(
      (var(--fluid-min) / 16) * 1rem,
      ((var(--fluid-min) / 16) * 1rem) -
        (((var(--fluid-preferred) * var(--font-width-min)) / 16) * 1rem) +
        (var(--fluid-preferred) * var(--variable-unit, 100vi)),
      (var(--fluid-max) / 16) * 1rem
    );
    font-size: var(--fluid-type);
  }

  *,
  *:after,
  *:before {
    box-sizing: border-box;
  }

  body {
    display: grid;
    place-items: center;
    background: light-dark(white, black);
    min-height: 100vh;
    font-family: 'Geist', 'SF Pro Text', 'SF Pro Icons', 'AOS Icons',
      'Helvetica Neue', Helvetica, Arial, sans-serif, system-ui;
  }

  body::before {
    --size: 45px;
    --line: color-mix(in hsl, canvasText, transparent 70%);
    content: '';
    height: 100vh;
    width: 100vw;
    position: fixed;
    background: linear-gradient(
          90deg,
          var(--line) 1px,
          transparent 1px var(--size)
        )
        50% 50% / var(--size) var(--size),
      linear-gradient(var(--line) 1px, transparent 1px var(--size)) 50% 50% /
        var(--size) var(--size);
    mask: linear-gradient(-20deg, transparent 50%, white);
    top: 0;
    transform-style: flat;
    pointer-events: none;
    z-index: -1;
  }

  .bear-link {
    color: canvasText;
    position: fixed;
    top: 1rem;
    left: 1rem;
    width: 48px;
    aspect-ratio: 1;
    display: grid;
    place-items: center;
    opacity: 0.8;
  }

  :where(.x-link, .bear-link):is(:hover, :focus-visible) {
    opacity: 1;
  }

  .bear-link svg {
    width: 75%;
  }

  /* Utilities */
  .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
  }
}

div.tp-dfwv {
  position: fixed;
}

you-can-scroll.markdown

you can scroll.

A Pen by Asapanna Rakesh on CodePen.

License.