What is GSAP

GreenSock Animation Platform (GSAP) is a well-known suite of JavaScript tools for creating web animations.

#index.html

...
<div class="mouse-icon">
	<div class="scroll-icon"></div>
</div>
...

#style.css

.mouse-icon {
	border: 2px solid #fff;
	width: 40px;
	height: 70px;
	display: flex;
	align-items: flex-end;
	justify-content: center;
	border-radius: 50px;
	padding: .6em;
	margin: 1em;
}

.mouse-icon .scroll-icon {
	width: 8px;
	height: 16px;
	background-color: #fff;
	border-radius: inherit;
}

#Output

We utilize GSAP to animate the scroll icon. 

Import core gsap js first, then write the animation part. 

#main.js

<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.5.1/gsap.min.js"></script>
<!-- GSAP scroll icon animation -->
<script>
	gsap.from('.scroll-icon',{
		y:-30,duration:1,repeat:-1,yoyo:true
	})
</script>