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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

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CSS

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CSS Base

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JavaScript

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HTML 

              
                
        <div id="flex">
            <div id="container">
                <div id="rotator">
                    <div class="image">
                        <img src="https://fjolt.com/demo/css-parallax/images/girl.jpg" alt="" />
                        <img src="https://fjolt.com/demo/css-parallax/images/girl.jpg" class="glitch" alt="" />
                    </div>
                    <div class="image">
                        <img src="https://fjolt.com/demo/css-parallax/images/girl.jpg" alt="" />
                        <img src="https://fjolt.com/demo/css-parallax/images/girl.jpg" class="glitch" alt="" />
                    </div>
                    <div class="image">
                        <img src="https://fjolt.com/demo/css-parallax/images/girl.jpg" alt="" />
                        <img src="https://fjolt.com/demo/css-parallax/images/girl.jpg" class="glitch" alt="" />
                    </div>
                    <div class="image">
                        <img src="https://fjolt.com/demo/css-parallax/images/girl.jpg" alt="" />
                        <img src="https://fjolt.com/demo/css-parallax/images/girl.jpg" class="glitch" alt="" />
                    </div>
                    <div class="image">
                        <img src="https://fjolt.com/demo/css-parallax/images/girl.jpg" alt="" />
                        <img src="https://fjolt.com/demo/css-parallax/images/girl.jpg" class="glitch" alt="" />
                    </div>
                </div>
            </div>
        </div>
        <div id="slide-text">
            <div id="text">The only demo you'll ever need.</div>
            <div id="instruction">
                <i class="fal fa-hand-pointer"></i> Drag me!
            </div>
        </div>
        <div id="content">
            <h1><a target="_top" href="https://fjolt.com/">Fjolt</a></h1>
            <div id="links">
                <a target="_top" href="https://fjolt.com/article/css-parallax-3d-image-composition/"><i class="fal fa-arrow-left"></i> Back to Article</a>
                <a target="_top" href="https://github.com/smpnjn/parallel-css-hero"><i class="fal fa-code-merge"></i> Github Repo</a>
                <a target="_top" href="https://twitter.com/thisisfjolt"><i class="fab fa-twitter"></i> Twitter</a>
            </div>
        </div>=
!

CSS 

              
                body {
    padding: 0;
    margin: 0;
    background: radial-gradient(circle at center left, #f79f2d, #ffe09b);
    font-family: "Source Sans Pro", -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    overflow: hidden;
    -webkit-user-drag: none;
    user-drag: none;
    cursor: grab;
    float: left;
    width: 100%;
    min-height: 150px;
}

#flex {
    margin: 5rem;
}
#container, #rotator {
    transform: scale(1);
    width: 60%;
    transform-origin: 24% 33% -500px;
    position: relative;
    transform-style: preserve-3d;
    position: absolute;
    perspective-origin: 50% 15%;
    width: 100%;
    top: 9rem;
    height: 100%;
    cursor: grab;
}

#container img {
    width: 100%;
    -webkit-user-drag: none;
    user-drag: none;
    border-radius: 10px;
    position: absolute;
    user-select: none;
}
#container .image:after {
    content: '';
    width: 3px;
    height: 500px;
    top: 0px;
    background: wheat;
    left: 0;
}

#container .image {
    position: relative;
    position: absolute;
    box-shadow: 0 0 200px rgb(181 93 0 / 42%);
    overflow: hidden;
    cursor: grab;
    transform-style: preserve-3d;
}
#container .image:nth-of-type(1) {
    width: 300px;
    height: 400px;
}


#container .image:nth-of-type(1) img {
    width: 540px;
    top: -312px;
    position: absolute;
}

#container .image:nth-of-type(2) {
    transform: scale(0.5) translateZ(-300px) translateY(-300px) translateX(70px);
    transform-origin: 0 0;
    width: 500px;
    height: 500px;
}
#container .image:nth-of-type(2) img {
    width: 930px;
    top: -250px;
    left: -12px;
    position: relative;
    transform: translateZ(-100px);
}
#container #rotator .image:nth-of-type(2) .glitch {
    width: 930px;
    top: -265px;
    left: -17px;
    transform: translateZ(-100px) translateX(-5px) translateY(-5px);
}
#container #rotator .glitch {
    opacity: 0;
    transition: opacity 0.6s ease-out;
    transform: translateX(-5px) translateY(-5px);
    mix-blend-mode: soft-light;
    position: absolute;
    filter: hue-rotate(120deg);
    top: -312px;
    left: 0;
}


#container #rotator.rotating .glitch {
    opacity: 0.6;
}
#container .image:nth-of-type(3) {
    transform: scale(0.5) translateZ(-600px) translateY(-300px) translateX(370px);
    transform-origin: 0 0;
    width: 546px;
    height: 500px;
}
#container .image:nth-of-type(3) img {
    width: 1042px;
    top: -301px;
    left: -354px;
    position: relative;
    transform: translateZ(-100px);
}
#container #rotator .image:nth-of-type(3) .glitch {
    width: 1042px;
    top: -314px;
    left: -335px;
    transform: translateX(-5px) translateY(-5px);
}

#container .image:nth-of-type(4) {
    transform: scale(0.5) translateZ(-400px) translateY(100px) translateX(470px);
    transform-origin: 0 0;
    width: 600px;
    height: 600px;
}
#container .image:nth-of-type(4) img {
    width: 1089px;
    top: -731px;
    left: -480px;
    position: relative;
}
#container #rotator .image:nth-of-type(4) .glitch {
    width: 1089px;
    top: -742px;
    position: absolute;
    left: -450px;
    transform: translateX(-5px) translateY(-5px);
}

#container .image:nth-of-type(5) {
    transform: scale(0.5) translateZ(-800px) translateY(200px) translateX(510px);
    transform-origin: 0 0;
    width: 450px;
    height: 780px;
}
#container .image:nth-of-type(5) img {
    width: 1030px;
    top: -750px;
    left: -471px;
    position: relative;
}
#container #rotator .image:nth-of-type(5) .glitch {
    width: 1089px;
    top: -742px;
    position: absolute;
    left: -450px;
    transform: translateX(-5px) translateY(-5px);
}

#content {
    z-index: 9999999;
    position: absolute;
    right: 0;
    top: 0;
    box-sizing: border-box;
    background: linear-gradient(90deg, #ffffffc4 0%, white 33%);
    padding: 2rem 4rem 2rem 4rem;
    box-shadow: 0 0 100px #d29b008f;
    background: transparent;
    box-shadow: none;
    height: auto;
    bottom: 0;
    width: 300px;
}

h1 {
    font-family: 'Bungee Outline', sans-serif;
    font-size: 2.5rem;
    margin: 0 0 2rem 0;
}
h1 a {
    color: black;
    text-decoration: none;
}
h1 i {
    margin: 0 0.5rem 0;
    font-size: 2rem;
    position: relative;
    top: -2px;
}

#content #links a {
    display: block;
    text-decoration: none;
    font-size: 1rem;
    text-transform: uppercase;
    color: #331a00;
    font-weight: 700;
    margin: 0 0 2rem 0;
    letter-spacing: 0.5px;
}

#links a i {
    margin: 0 0.25rem 0 0;
}
#links {
    position: absolute;
    bottom: 0;
    right: 3rem;
    bottom: 0;
    right: 3rem;
    z-index: 99999;
    transform: translateZ(100px);
}
#content #links a:hover {
    text-decoration: underline;
}
#instruction {
    top: -1rem;
    font-size: 1.25rem;
    background: linear-gradient(180deg, #302206d9, #302206);
    box-shadow: 0 0 30px rgb(128 79 16 / 58%);
    padding: 0.75rem 1.5rem;
    border-radius: 100px;
    color: white;
    display: inline-block;
    font-weight: 600;
    position: relative;
    font-family: 'Source Sans', sans-serif;
}

#instruction i {
    margin: 0 0.25rem 0 0;
}
#slide-text {
    position: absolute;
    top: 10rem;
    left: 600px;
    user-select: none;
    color: #2f2106;
    z-index: 9999999;
    font-family: 'Abril Fatface';
    font-size: 4rem;
    text-shadow: 5px 5px 0 #faa43500;
    width: 350px;
}

#content > h1 {
    display: none;
}

@media screen and (max-width: 900px) {
    #slide-text > #text {
        display: none;
    }
    #slide-text {
        left: 2rem;
        top: 2rem;
    }
    #container, #rotator {
        top: 5rem;
        left: -4rem;
    }
    #flex {
        transform: scale(0.5);
    }
}
!

JS 

              
                document.addEventListener('DOMContentLoaded', function(e) {
    let scale = 1;
    document.body.addEventListener('wheel', function(e) {
        if(scale >= 0.4 && scale <= 1.8) {
            scale = scale - (e.deltaY / 500);
        } 
        
        if(scale < 0.4) {
            scale = 0.42;
        } 
        if(scale > 1.8) {
            scale = 1.78;
        }


        document.getElementById('container').style.transform = `scale(${scale})`;
    });

    let drag = false;
    let startPointY = 0;
    let startPointX = 0;
    let currentRotationY = 0;
    let currentRotationX = 0;

    let reduceRotate;
    let curValueX = 0;
    let curValueY = 0;

    document.body.addEventListener('pointerdown', function(e) {
        drag = true;
        if(typeof reduceRotate !== "undefined") {
            clearInterval(reduceRotate);
        }
        startPointY = e.pageX;
        startPointX = e.pageY;
        if(typeof document.getElementById('rotator').style.transform.split('rotateY(')[1] !== "undefined") {
            currentRotationY = parseFloat(document.getElementById('rotator').style.transform.split('rotateY(')[1].split(')')[0]);
        }
        if(typeof document.getElementById('rotator').style.transform.split('rotateX(')[1] !== "undefined") {
            currentRotationX = parseFloat(document.getElementById('rotator').style.transform.split('rotateX(')[1].split(')')[0]);
        }
    });

    ['pointerup', 'pointerleave'].forEach(function(item) {
        
        document.body.addEventListener(item, function(e) {
            drag = false;
            document.getElementById('rotator').classList.remove('rotating');
        });
    });

    document.body.addEventListener('pointermove', function(e) {
        let changeY = (e.pageX - startPointY) / 5;
        let changeX = (e.pageY - startPointX) / 5;
        if(drag == true) {
            document.getElementById('rotator').classList.add('rotating');
            document.getElementById('rotator').style.transform = `rotateY(${changeY + currentRotationY}deg) rotateX(${-changeX + currentRotationX}deg)`;
        }
    });
});
!
999px

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