<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<style>
.loading{
background: orangered;
position: absolute;
top: 0;
bottom: 0;
right: 0;
height: 100%;
width: 100%;
z-index: -99;
}
button{
padding: 10px 30px;
background:#323232;
color: white;
outline: none;
border: none;
position: absolute;
z-index: 9;
top: 45%;
left: 45%;
cursor: pointer;
}
</style>
<body>
<div class="loading"> </div>
<div class="btn">
<button>CLick</button>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js "></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.2.6/gsap.min.js "></script>
<script>
const ld_gray = gsap.timeline({paused: true});
ld_gray.from('.loading', {duration: 1, delay: 0.5, scaleX: 0, transformOrigin: 'left', ease: "expo.out",});
ld_gray.to('.loading', {duration: 1, delay: 1, scaleX: 0, transformOrigin: 'right', ease: "expo.in",} );
$('button').click(function () {
ld_gray.restart();
});
</script>
</body>
</html>