3_loader.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.10.1/jquery.min.js" integrity="sha512-eH6+OZuv+ndnPTxzVfin+li0PXKxbwi1gWWH2xqmljlTfO3JdBlccZkwWd0ZcWAtDTvsqntx1bbVSkWzHUtfQQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
    <link rel="stylesheet" href="3.css">
    <title>Loader</title>
</head>
<body>
    <div class="main">
        <div class="loader">
            <div></div>
            <div></div>
            <div></div>
        </div>
    </div>
</body>
<script>
    setTimeout(function(){
        $('.loader').fadeToggle();
    },2000)
</script>
</html>