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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <button>
	<span class="text">✨ hover me ✨</span>
	<svg viewBox="0 0 100 50" preserveAspectRatio="none">
		<defs>
			<filter id="shadow" filterUnits="userSpaceOnUse" height="200%" width="200%" y="-50%" x="-50%">
				<feDropShadow dx="0" dy="6" stdDeviation="6" flood-color="#17BBAB" flood-opacity="0.4" />
			</filter>

			<filter id="border" filterUnits="userSpaceOnUse" height="200%" width="200%" y="-50%" x="-50%">
				<feMorphology in="SourceAlpha" result="DILATED" operator="dilate" radius="1.2"></feMorphology>

				<feFlood flood-color="#fff" flood-opacity="1" result="WHITE"></feFlood>
				<feComposite in="WHITE" in2="DILATED" operator="in" result="OUTLINE"></feComposite>

				<feMerge>
					<feMergeNode in="OUTLINE" />
					<feMergeNode in="SourceGraphic" />
				</feMerge>
			</filter>
		</defs>
		<g class="focus">
			<polyline stroke="#17bbab" id="wibble" fill="none" stroke-width="40" stroke-linecap="round" stroke-linejoin="round" />
		</g>
	</svg>
</button>

<p class="footer"><span class="cursive">inspired by </span><a class="small" href="https://greensock.com/forums/topic/27839-liquid-button-using-gsap-library/">this GSAP thread...</a></p>
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CSS 

              
                body {
	min-height: 100vh;
	display: flex;
	align-items: center;
	justify-content: center;
	background-color: #d0f0ed;
	overflow: hidden;
	padding: 0;
	margin: 0;
}

button {
	position: relative;
	outline: none;
	border: none;
	border-radius: 99px;
	padding: 1rem 2rem;
	background-color: transparent;
	overflow: visible;
	color: white;
	opacity: 0;
	font-family: "Dosis", sans-serif;
}

#wibble {
	filter: url(#shadow);
}

button:focus .focus {
	filter: url(#border);
}

button span {
	position: relative;
	z-index: 2;
	font-size: var(--step-0);
}

svg {
	position: absolute;
	top: 50%;
	right: 0;
	left: 15%;
	width: 75%;
	transform: translateY(-46%);
	z-index: 1;
	overflow: visible;
	pointer-events: none;
}

.footer {
	position: absolute;
	bottom: 0;
	left: 0;
	padding: 1rem;
	color: var(--dark);
	margin: 0;

	a {
		color: var(--dark);
		text-decoration: none;
		border-bottom: solid 1px var(--dark);
	}

	p {
		margin: 0;
	}
}
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JS 

              
                let svg = document.querySelector("svg");
let wibble = document.querySelector("#wibble");
let width = 100;
let pointz = 30;
let spacing = width / pointz;
let pointzArray = [];
let mySplitText = new SplitText(".text", { type: "chars" });
let chars = mySplitText.chars;
let amplitude = 10;
let duration = 0.4;

function staggerText(direction) {
	gsap.to(chars, {
		duration: duration / 3,
		y: amplitude * -1,
		ease: "Sine.easeInOut",
		stagger: {
			amount: duration / 3,
			yoyo: true,
			repeat: 1,
			from: direction
		}
	});
}

for (var i = 0; i < pointz; i++) {
	let position = i / (pointz - 1);

	let point = wibble.points.appendItem(svg.createSVGPoint());

	point.x = i * spacing;
	point.y = 25;

	pointzArray.push(point);
}

let button = document.querySelector("button");
gsap.set(button, { opacity: 1 });
let isAnimating = false;
let reservedArray = [...pointzArray].reverse();

button.addEventListener("mouseenter", (e) => {
	if (isAnimating === true) return;

	let buttonCoords = button.getBoundingClientRect();
	let middle = buttonCoords.left + buttonCoords.width / 2;
	let leftSide = e.clientX < middle;

	if (leftSide) {
		staggerText("start");
		wibbleButton(reservedArray);
	} else {
		staggerText("end");
		wibbleButton(pointzArray);
	}

	isAnimating = true;
});

function wibbleButton(array) {
	array.forEach((point, index) => {
		let mapper = gsap.utils.mapRange(0, pointz, 0, 0.4);

		if (index === 0) {
			gsap
				.to(point, {
					keyframes: [
						{ y: `+=${amplitude}`, ease: "Sine.easeInOut" },
						{ y: `-=${amplitude * 2}`, ease: "Sine.easeInOut" },
						{ y: `+=${amplitude}`, ease: "Sine.easeInOut" }
					],
					yoyo: true,
					duration: duration,
					onComplete: () => {
						isAnimating = false;
					}
				})
				.progress(mapper(index));
		} else {
			gsap
				.to(point, {
					keyframes: [
						{ y: `+=${amplitude}`, ease: "Sine.easeInOut" },
						{ y: `-=${amplitude * 2}`, ease: "Sine.easeInOut" },
						{ y: `+=${amplitude}`, ease: "Sine.easeInOut" }
					],
					yoyo: true,
					duration: duration
				})
				.progress(mapper(index));
		}
	});
}
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