Book Flipping Animation

<!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>Book Flipping Animation</title>
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Hind&display=swap" rel="stylesheet">
    <style>
        * {
            margin: 0;
            padding: 0;
            font-family: 'Hind', sans-serif;
        }

        body {
            background-color: #383838;
        }

        section {
            width: 100%;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .book {
            background-color: #fff;
            width: 300px;
            height: 200px;
            border-radius: 20px;
            perspective: 600px;
            position: relative;
        }

        .book::before {
            content: '';
            position: absolute;
            z-index: 5;
            width: 50%;
            height: 100%;
            right: 50%;
            background-color: #707070;
            border-radius: 20px 0 0 20px;
            transform-origin: center right;
            transform: rotateY(180deg);
            transition: 0.7s ease all;
        }

        .book:hover::before {
            transform: rotateY(0deg);
        }

        .book .pg {
            position: absolute;
            width: 50%;
            top: 0;
            bottom: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            color: #fff;
            font-size: 30px;
            font-weight: bold;
        }

        .book .pg.pg1 {
            background-color: #ee5f2a;
            border-radius: 20px 0 0 20px;
            left: 0;
        }
        
        .book .pg.pg2 {
            background-color: #30a5da;
            right: 0;
            border-radius: 0 20px 20px 0;
        }
    </style>
</head>
<body>
    <section>
        <div class="book">
            <div class="pg pg1">HTML</div>
            <div class="pg pg2">CSS</div>
        </div>
    </section>
</body>
</html>
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Result Screenshot(s)

Book Flipping AnimationWorking Sample0