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Insecure Resource

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CSS

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HTML 

              
                <!-- fake body -->

<body class="overflow-x-hidden font-semibold text-white text-5xl" style="font-family:'Open Sans';">
  <!-- fake body -->

  <!-- section a: blank -->
  <section class="bg-red-600 min-h-screen flex items-center justify-center">A</section>
  <!-- section b: animate b simple -->
  <section class="bg-blue-600 min-h-screen flex items-center justify-center relative st--section-b">
    <div class="absolute left-0 top-0 h-[30px] w-[30px] bg-white flex items-center justify-center st--block-b text-xl text-black">B</div>
  </section>

  <!-- horizontal scolling -->
  <section class="bg-yellow-600 min-h-screen w-[500%] flex flex-no-wrap st--horizontal">
    <!-- section c1: yeah up + down -->
    <div class="w-screen bg-purple-900 min-h-screen relative flex justify-center st--section-c1">
      <div class="h-1/2 w-1/4 flex items-center justify-center bg-black st--piston-odd">Y</div>
      <div class="h-1/2 w-1/4 flex items-center justify-center top-auto bottom-0 self-end bg-white text-black st--piston-even">E</div>
      <div class="h-1/2 w-1/4 flex items-center justify-center bg-black st--piston-odd">A</div>
      <div class="h-1/2 w-1/4 flex items-center justify-center top-auto bottom-0 self-end bg-white text-black st--piston-even">H</div>
    </div>
    <!-- section c2: pattern down -->
    <div class="w-screen bg-purple-800 min-h-screen flex items-center justify-center relative st--section-c2">
      <img src="https://kubikdesign.com.au/codepen/pattern.svg" class="st--pattern w-full absolute z-1 bottom-0 left-0">
      <div class="leading-none text-8xl">HELL<br>YEAH</div>
    </div>
    <!-- section c3: moving block around corners -->
    <div class="w-screen bg-purple-700 min-h-screen relative st--section-c3">
      <div class="absolute left-0 bottom-0 z-10 h-[150px] w-[150px] rounded-full bg-red-600 flex items-center justify-center text-xl text-white st--block-c3">3</div>
    </div>
    <!-- section c4: bg color change -->
    <div class="w-screen bg-black min-h-screen flex items-center justify-center relative st--section-c4">
      <img src="https://kubikdesign.com.au/codepen/bg-letters.svg" class="absolute inset-0 z-0 w-full h-full object-contain st--block-c4">
    </div>
    <!-- blank -->
    <div class="w-screen bg-purple-500 min-h-screen flex items-center justify-center">5</div>
    <!-- end -->
  </section>
  <!-- end: horizontal scolling -->

  <!-- blank sections -->
  <section class="bg-pink-600 min-h-screen flex items-center justify-center">D</section>
  <section class="bg-green-600 min-h-screen flex items-center justify-center">E</section>

  <!-- fake body -->
</body>
!

CSS
!

JS 

              
                // function: generate random color
function randomColor() {
    var m = new Array()
    for (var i = 0; i < 80; i++) {
        m.push(
            '#' +
                Math.floor(Math.random() * 10) +
                Math.floor(Math.random() * 10) +
                Math.floor(Math.random() * 10)
        ) // to construct a color arrary.
    }
    return m
}

// function: generate random linear gradient
function createHex() {
    var hexCode1 = ''
    var hexValues1 = '0123456789abcdef'

    for (var i = 0; i < 6; i++) {
        hexCode1 += hexValues1.charAt(
            Math.floor(Math.random() * hexValues1.length)
        )
    }
    return hexCode1
}
function generate() {
    var deg = Math.floor(Math.random() * 360)
    var gradient =
        'linear-gradient(' +
        deg +
        'deg, ' +
        '#' +
        createHex() +
        ', ' +
        '#' +
        createHex() +
        ')'
    return gradient
}

// register scrollTrigger
gsap.registerPlugin(ScrollTrigger)

// horizontal scrolling
let sections = gsap.utils.toArray('.st--horizontal > div')
let scrollTween = gsap.to(sections, {
    xPercent: -100 * (sections.length - 1),
    ease: 'none',
    scrollTrigger: {
        trigger: '.st--horizontal',
        pin: true,
        scrub: 1,
        // snap: 1 / (sections.length - 1),
        // base vertical scrolling on how wide the container is so it feels more natural
        end: () => '+=' + document.querySelector('.st--horizontal').offsetWidth,
    },
})

// animate block b simple
gsap.to('.st--block-b', {
    // x: document.querySelector('.st--section-b').offsetWidth,
    y: () => document.querySelector('.st--section-b').offsetHeight,
    rotation: 360,
    ease: 'none',
    scrollTrigger: {
        trigger: '.st--section-b',
        start: 'top top', // when the top of the trigger hits the top of the viewport
        end: 'bottom top',
        scrub: true, // use value for a delayed effect
    },
})

// https://greensock.com/forums/topic/35004-gsap3-scrolltrigger-scrub-enabled-move-element-up-and-then-down/
gsap.to('.st--piston-even, .st--piston-odd', {
    // odd goes -100%, even goes 100%
    y: i => (i % 2 ? '-100%' : '100%'),
    ease: 'none',
    yoyo: true,
    repeat: 2,
    scrollTrigger: {
        trigger: '.st--section-c1',
        containerAnimation: scrollTween,
        start: 'left left',
        scrub: true,
    },
})

// section c2: pattern overlay down
gsap.to('.st--pattern', {
    // v1
    yPercent: 50,
    ease: 'none',
    scrollTrigger: {
        trigger: '.st--section-c2',
        containerAnimation: scrollTween,
        // start: 'left left',
        start: () =>
            '-=' +
            document.querySelector('.st--section-c2').offsetWidth +
            ' left',
        end: () =>
            '+=' + document.querySelector('.st--section-c2').offsetWidth * 2,
        scrub: true,
    },
})

// section c3: moving colour changing block
var tl = gsap.timeline({
    scrollTrigger: {
        trigger: '.st--section-c3',
        containerAnimation: scrollTween,
        scrub: true,
        start: () =>
            '-=' +
            document.querySelector('.st--section-c3').offsetWidth / 2 +
            ' left',
        end: () => '+=' + document.querySelector('.st--section-c3').offsetWidth,
    },
})

// section c3: moving block
tl.to('.st--block-c3', {
    ease: 'none',
    y: () =>
        -document.querySelector('.st--section-c3').offsetHeight +
        document.querySelector('.st--block-c3').offsetHeight,
})
    .to('.st--block-c3', {
        ease: 'none',
        x: () =>
            document.querySelector('.st--section-c3').offsetWidth -
            document.querySelector('.st--block-c3').offsetWidth,
    })
    .to('.st--block-c3', {
        ease: 'none',
        y: () => 0,
    })
    .to('.st--block-c3', {
        ease: 'none',
        x: () =>
            document.querySelector('.st--section-c3').offsetWidth * 0.5 -
            document.querySelector('.st--block-c3').offsetWidth,
    })

// section c3: changing block colour
var tlColor = gsap.timeline({
    scrollTrigger: {
        trigger: '.st--section-c3',
        containerAnimation: scrollTween,
        scrub: true,
        start: () =>
            '-=' +
            document.querySelector('.st--section-c3').offsetWidth / 2 +
            ' left',
        end: () => '+=' + document.querySelector('.st--section-c3').offsetWidth,
    },
})
tlColor
    .to('.st--block-c3', {
        ease: 'none',
        backgroundColor: randomColor,
    })
    .to('.st--block-c3', {
        ease: 'none',
        backgroundColor: randomColor,
    })
    .to('.st--block-c3', {
        ease: 'none',
        backgroundColor: randomColor,
    })
    .to('.st--block-c3', {
        ease: 'none',
        backgroundColor: randomColor,
    })
    .to('.st--block-c3', {
        ease: 'none',
        backgroundColor: randomColor,
    })
    .to('.st--block-c3', {
        ease: 'none',
        backgroundColor: randomColor,
    })

// section c4: background image colour change
var tlBackgroundColor = gsap.timeline({
    scrollTrigger: {
        trigger: '.st--section-c4',
        containerAnimation: scrollTween,
        scrub: true,
        // markers: true,
        // start: 'left left',
        start: () =>
            '-=' +
            document.querySelector('.st--section-c4').offsetWidth +
            ' left',
        end: () =>
            '+=' + document.querySelector('.st--section-c4').offsetWidth * 2,
    },
})
tlBackgroundColor
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
    .to('.st--block-c4', {
        ease: 'none',
        backgroundImage: generate,
    })
!
999px

Console