@DownPW Looking at the underlying code, class start is being added on hover by jQuery in this function

document.querySelectorAll(".button-gradient, .button-transparent").forEach((button) => { const style = getComputedStyle(button); const lines = document.createElement("div"); lines.classList.add("lines"); const groupTop = document.createElement("div"); const groupBottom = document.createElement("div"); const svg = createSVG( button.offsetWidth, button.offsetHeight, parseInt(style.borderRadius, 10) ); groupTop.appendChild(svg); groupTop.appendChild(svg.cloneNode(true)); groupTop.appendChild(svg.cloneNode(true)); groupTop.appendChild(svg.cloneNode(true)); groupBottom.appendChild(svg.cloneNode(true)); groupBottom.appendChild(svg.cloneNode(true)); groupBottom.appendChild(svg.cloneNode(true)); groupBottom.appendChild(svg.cloneNode(true)); lines.appendChild(groupTop); lines.appendChild(groupBottom); button.appendChild(lines); button.addEventListener("pointerenter", () => { button.classList.add("start"); }); svg.addEventListener("animationend", () => { button.classList.remove("start"); }); }); })

The CSS for start is below

.button-gradient.start .lines svg, .button-transparent.start .lines svg { animation: stroke 0.3s linear; }

And this is the corresponding keyframe

@keyframes stroke { 30%, 55% { opacity: 1; } 100% { stroke-dashoffset: 5; opacity: 0; } }

It’s using both CSS and SVG, so might not be a simple affair to replicate without the SVG files.