The gradient follows the hover effect of the mouse cursor.
HTML CODE:
<button class="mouse-cursor-gradient-tracking">
<span>Hover me</span>
</button>
CSS CODE:
.mouse-cursor-gradient-tracking {
position: relative;
background: #7983ff;
padding: 0.5rem 1rem;
font-size: 1.2rem;
border: none;
color: white;
cursor: pointer;
outline: none;
overflow: hidden;
}
.mouse-cursor-gradient-tracking span {
position: relative;
}
.mouse-cursor-gradient-tracking::before {
--size: 0;
content: '';
position: absolute;
left: var(--x);
top: var(--y);
width: var(--size);
height: var(--size);
background: radial-gradient(circle closest-side, pink, transparent);
transform: translate(-50%, -50%);
transition: width 0.2s ease, height 0.2s ease;
}
.mouse-cursor-gradient-tracking:hover::before {
--size: 200px;
}
SCRIPT CODE:
<script type="text/javascript">
var btn = document.querySelector('.mouse-cursor-gradient-tracking')
btn.onmousemove = function (e) {
var x = e.pageX - btn.offsetLeft
var y = e.pageY - btn.offsetTop
btn.style.setProperty('--x', x + 'px')
btn.style.setProperty('--y', y + 'px')
}
</script>
Description
To-do list
note!
If the element's parent has a positioning context ( position: relative ), you also need to subtract its offset.
var x = e.pageX - btn.offsetLeft - btn.offsetParent.offsetLeft
var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
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