index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Image Zoom Effect!</title>
    <style>
        body{
            height: 100vh;
            display: grid;
            place-items: center;
            background: #363942;
        }
        .zoom{
            position: relative;
            /* width: min(800px, 90vw);
            height: 90vmin; */
            width: 600px;
            height: 400px;
            border: 6px solid white;
            /* box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3); */
            box-shadow: -1px 5px 15px #000;
            overflow: hidden;
            /* cursor: zoom-in; */
        }
        .zoom-img{
            position: absolute;
            width: 100%;
            height: 100%;
            -o-object-fit: cover;
            object-fit: cover;
            /* top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) scale(1); */
            transform: scale(var(--zoom, 1));
            transform-origin: var(--x) var(--y);
            transition: transform 0.3s ease;
            display: block;
        }
        .zoom:hover{
            --zoom: 2;
        }
    </style>
</head>
<body>
    <main class="zoom">
        <img src="OIP.jpg" alt="" class="zoom-img">
    </main>
    <script>
        document.querySelectorAll('.zoom').forEach(elem => {
            let x, y, width, height;

            elem.onmouseenter = (e) => {
                const size = elem.getBoundingClientRect();
                x = size.x;
                y = size.y;
                width = size.width;
                height = size.height;
            };

            elem.onmousemove = (e) => {
                const horizontal = ((e.clientX - x) / width) * 100;
                const vertical = ((e.clientY - y) / height) * 100;
                elem.style.setProperty('--x', horizontal + '%');
                elem.style.setProperty('--y', vertical + '%');
            };
        });
    </script>
</body>

</html>