Bootstrap Snippet background move on mouse move using HTML CSS Javascript

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Parallax movvement on mouse move</title>
    <link href="https://fonts.googleapis.com/css2?family=Roboto&display=swap" rel="stylesheet">
</head>
<body>
    <div class="container">
        <div class="word-container">
            <h1 class="parallaxit">Parallax Effect</h1>
            <p class="w1 parallaxit">Easy parallax with CSS Variables. </p>
            
            <div class="btn-container parallaxit">
                <a target=_blank class="btn" href="https://github.com/benoitdelorme/">My Github</a>
                <a target=_blank class="btn" href="https://www.youtube.com/channel/UC6CFdR2zAt0wTC8CPPhqvGw">My Youtube</a>
            </div>
                
        </div>
    </div>
</body>
</html>
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body, h1, p{
    margin: 0;
    padding: 0;
}
h1 {
    font-size: 5em;
}
p {
    font-size: 1em;
    max-width: 30em;
    margin: 10px auto;
}
.container {
    position: absolute;
    height: 100vh;
    width: 100%;
    background-color: black;
    color: white;
    font-family: Roboto;
    display: flex;
    align-items: center;
    justify-content: center;
}
.container .word-container {
    text-align: center;
}
.btn-container {
    margin: 25px 0 0;
}
.btn {
    position: relative;
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var parallaxIt = function(e, target, parent, movement) {
    var relX = e.pageX - offset(parent).left
    var relY = e.pageY - offset(parent).top
    var x = (relX - parent.offsetWidth / 2) / parent.offsetWidth * movement
    var y = (relY - parent.offsetHeight / 2) / parent.offsetHeight * movement
    
    target.style.setProperty('--parallax-x', x+"px");
    target.style.setProperty('--parallax-y', y+"px");
  }
function offset(el) {
    var rect = el.getBoundingClientRect(),
        scrollLeft = window.pageXOffset || document.documentElement.scrollLeft,
        scrollTop = window.pageYOffset || document.documentElement.scrollTop
    return { top: rect.top + scrollTop, left: rect.left + scrollLeft }
}
document.querySelector(".container").addEventListener("mousemove", function(e) {
    parallaxIt(e, this.querySelector("h1"), this, 80)
    parallaxIt(e, this.querySelector("p"), this, 60)
    parallaxIt(e, this.querySelector(".btn-container"), this, 40)
})
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"background move on mouse move"
Bootstrap 4.1.1 Snippet by ALIMUL AL RAZY

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"background move on mouse move" Bootstrap 4.1.1 Snippet by ALIMUL AL RAZY

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"background move on mouse move"
Bootstrap 4.1.1 Snippet by ALIMUL AL RAZY