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HTML

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About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>css-skewed-background</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            font-size: 62.5%;
        }

        body {
            min-height: 100vh;
            background: #222;
            display: grid;
            place-content: center;
            transform: perspective(800px);
            transform-style: preserve-3d;
        }

        .inner {
            display: block;
            margin: 0 auto;
            /* perspective: 100px; */
            transform-style: preserve-3d;
            transform-origin: center;
            transform: perspective(800px);
            border: 0px solid transparent;
            transition: transform .5s ease, border .5s ease;
        }

        .expand:has(input:not(:checked)) {
            color: #222;
        }

        body:has(.expand input:checked) .inner {
            transform: perspective(800px) skew(0deg, -10deg) rotateY(25deg) scale(.5) translateY(-50px) translateX(40px);
            border: 5px solid white;
            border-top: none;
            width: 80%;
        }

        body:has(.expand input:checked) .inner section:nth-child(1) {
            border-top: 5px solid white;
        }

        body:has(.expand input:checked) .inner section:nth-child(1)::before {
            transform: skew(0, -10deg);
        }

        .expand {
            position: absolute;
            top: 10px;
            right: 10px;
            font-size: 2em;
            font-family: Poppins;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 5px;
            z-index: 10;
            color: springgreen;
            transition: color .5s ease;
        }

        .expand input {
            appearance: none;
            width: 20px;
            aspect-ratio: 1;
            z-index: 1;
            cursor: pointer;
        }

        .expand::after {
            content: "";
            position: absolute;
            left: -2px;
            width: 20px;
            height: 20px;
            border-radius: 5px;
            border: 2px solid currentColor;
            background: radial-gradient(circle 5px, transparent 5px, transparent 6px);
            font-size: 1em;
            text-align: center;
            display: flex;
            align-items: center;
            justify-content: center;
            vertical-align: middle;
            pointer-events: none;
        }

        .expand:has(input:checked)::after {
            background: radial-gradient(circle 5px, currentColor 5px, transparent 6px);
        }

        section {
            position: relative;
            width: 100%;
            height: 300px;
            font-family: Poppins;
            font-size: 1em;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            justify-content: center;
            gap: 15px;
            padding: 2em;
        }

        section h1 {
            font-size: 4em;
            font-weight: 700;
            color: #222;
        }

        section p {
            font-size: 1.2em;
        }

        section:nth-child(2) {
            align-items: flex-end;
            color: #fff;
        }

        section:nth-child(2) h1 {
            color: springgreen;
        }

        section:nth-child(1) {
            /* background: springgreen; */
        }

        section:nth-child(1)::before {
            content: "";
            position: absolute;
            inset: 0;
            top: -50%;
            height: 150%;
            background-color: springgreen;
            z-index: -1;
            transform: skew(0deg, -10deg);
            box-shadow: 0 -50px 100px 50px transparent;
        }

        section:nth-child(1):hover::before {
            box-shadow: 0 -50px 100px 50px springgreen;
        }


        @media screen and (max-width:576px) {
            html {
                font-size: 50%;
            }
        }
    </style>
</head>

<body>
    <div class="expand">
        <input type="checkbox" name="expand">
        <label for="expand">Expand</label>
    </div>
    <div class="inner">
        <section>
            <h1>Gorithm is here</h1>
            <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Tempore, quae! Voluptate esse placeat aperiam
                eos
                iusto tempore quaerat doloremque et voluptates commodi maiores consequatur corporis dolore sequi modi
                quas,
                pariatur tempora illum. In consequuntur distinctio recusandae labore, vitae consectetur sequi molestias
                illum tempore a possimus quod nihil. Adipisci, ducimus placeat.</p>

        </section>
        <section>
            <h1>Gorithm is here again</h1>
            <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Tempore, quae! Voluptate esse placeat aperiam
                eos
                iusto tempore quaerat doloremque et voluptates commodi maiores consequatur corporis dolore sequi modi
                quas,
                pariatur tempora illum. In consequuntur distinctio recusandae labore, vitae consectetur sequi molestias
                illum tempore a possimus quod nihil. Adipisci, ducimus placeat.</p>
        </section>
    </div>
</body>

</html>
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