"Mouse movement button with border-radius"
Bootstrap 4.1.1 Snippet by koshikojha

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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 ---------->
<button class="button">
<span>Hover me I'm awesome</span>
</button>
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body {
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
background: white;
}
.button {
position: relative;
appearance: none;
background: #f72359;
padding: 1em 2em;
border: none;
color: white;
font-size: 1.2em;
cursor: pointer;
outline: none;
overflow: hidden;
border-radius: 100px;
}
span {
position: relative;
pointer-events: none;
}
button::before {
--size: 0;
content: '';
position: absolute;
left: var(--x);
top: var(--y);
width: var(--size);
height: var(--size);
background: radial-gradient(circle closest-side, #4405f7, transparent);
transform: translate(-50%, -50%);
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document.querySelector('.button').onmousemove = (e) => {
const x = e.pageX - e.target.offsetLeft
const y = e.pageY - e.target.offsetTop
e.target.style.setProperty('--x', `${ x }px`)
e.target.style.setProperty('--y', `${ y }px`)
}
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