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HTML

About HTML Preprocessors

HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

Add External Stylesheets/Pens

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You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

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HTML 

              
                <a href="#myAnchor" class="go-top"><i class="fa fa-chevron-up"></i></a>
<div class="wrapper" id="myAnchor" >
<h2>Scroll down for show the anchor link</h2>

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam auctor leo id libero venenatis, a lobortis turpis tristique. Ut condimentum nunc ut erat ornare molestie. Sed ut viverra lorem, a scelerisque felis. Duis eu tristique leo. Aenean aliquam enim at pharetra gravida. Duis sagittis ut tortor quis condimentum. In at urna malesuada, egestas neque eget, tristique lectus. Sed id mi tempor, luctus eros a, consequat justo. Nam ultrices neque quis vestibulum blandit. Aenean pulvinar augue leo, sed rutrum ligula lacinia in. Sed commodo, ante eu lobortis dignissim, tellus ante volutpat felis, nec porta velit ipsum nec metus. Cras quis tellus quis sapien volutpat pellentesque. Donec sed est iaculis, blandit elit ut, tempus arcu.</p>

<p>Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Integer mollis nec odio a malesuada. Vestibulum ornare ultricies risus gravida mattis. Praesent a massa a ex dictum lacinia in at elit. Ut ut erat rhoncus, scelerisque nunc in, lobortis ligula. Duis a augue vel mi eleifend bibendum. Nunc quis urna vel velit rutrum iaculis. Duis quis odio nisl. Morbi vel finibus dolor, vel feugiat neque. Pellentesque in tempor dolor, at feugiat tortor. Pellentesque et hendrerit nulla, ullamcorper egestas est. Vivamus mollis augue id sodales dignissim.</p>

<p>Suspendisse potenti. Proin vestibulum ipsum a lectus sollicitudin aliquet. In accumsan tortor quis tempus commodo. Aliquam tempus imperdiet posuere. Sed ac congue massa. Vivamus dapibus ex id porta iaculis. Praesent ultrices, nisl ut faucibus imperdiet, leo sem scelerisque lorem, scelerisque imperdiet lacus elit vel risus. Nulla sed sem sapien. Fusce eget tempor orci. Donec eget scelerisque libero, nec rhoncus turpis. In felis ex, maximus vel elit sed, volutpat placerat erat. Nam consectetur sed nulla vel aliquet.</p>

<p>Maecenas euismod quam at nisi tincidunt fringilla. Aliquam vehicula, purus sit amet placerat euismod, odio mi vestibulum mi, a sagittis diam purus at nisl. Pellentesque semper sollicitudin dictum. Mauris eleifend augue augue, in eleifend augue efficitur eu. Quisque vestibulum placerat nunc ut scelerisque. Nulla a justo odio. Donec ullamcorper dolor vitae elit hendrerit tempus. Integer orci nulla, cursus quis blandit non, mollis eu purus. Vestibulum blandit mi vitae libero convallis, eget placerat tortor tincidunt.</p>

<p>Proin ac dapibus est. Suspendisse in quam egestas, posuere dolor sed, mollis lectus. Aenean risus lectus, placerat quis urna vel, vehicula vulputate nibh. Curabitur venenatis dapibus metus, non efficitur arcu aliquet vel. Nam rhoncus felis ac quam pellentesque, eu eleifend nisl tempor. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Phasellus ac turpis ut justo volutpat sodales. Integer venenatis dolor non quam ultricies dapibus. Duis pharetra sapien mi, quis finibus lorem mollis sit amet. Proin et sapien vel est auctor varius vel sit amet leo. Aenean cursus lacus quis varius maximus. Sed quis nunc sit amet eros tincidunt varius sed id neque. Duis risus dolor, ultricies ac sodales vitae, egestas gravida quam. Donec quis sollicitudin ante.</p>

<p>Nam ac dignissim velit. Aliquam a tortor tristique, vulputate nisi ac, sollicitudin massa. Vestibulum vitae nisl odio. Sed non magna ut arcu efficitur facilisis. Sed nec orci blandit, tincidunt sapien at, posuere nulla. Etiam ut elit nisl. Duis eu viverra eros. Curabitur vestibulum dapibus leo a euismod. Fusce sollicitudin blandit massa a posuere. Aenean convallis efficitur diam, ac sodales neque consectetur quis. Nulla efficitur sem quis massa porta porttitor. Pellentesque et luctus nibh. </p>

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam auctor leo id libero venenatis, a lobortis turpis tristique. Ut condimentum nunc ut erat ornare molestie. Sed ut viverra lorem, a scelerisque felis. Duis eu tristique leo. Aenean aliquam enim at pharetra gravida. Duis sagittis ut tortor quis condimentum. In at urna malesuada, egestas neque eget, tristique lectus. Sed id mi tempor, luctus eros a, consequat justo. Nam ultrices neque quis vestibulum blandit. Aenean pulvinar augue leo, sed rutrum ligula lacinia in. Sed commodo, ante eu lobortis dignissim, tellus ante volutpat felis, nec porta velit ipsum nec metus. Cras quis tellus quis sapien volutpat pellentesque. Donec sed est iaculis, blandit elit ut, tempus arcu.</p>

<p>Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Integer mollis nec odio a malesuada. Vestibulum ornare ultricies risus gravida mattis. Praesent a massa a ex dictum lacinia in at elit. Ut ut erat rhoncus, scelerisque nunc in, lobortis ligula. Duis a augue vel mi eleifend bibendum. Nunc quis urna vel velit rutrum iaculis. Duis quis odio nisl. Morbi vel finibus dolor, vel feugiat neque. Pellentesque in tempor dolor, at feugiat tortor. Pellentesque et hendrerit nulla, ullamcorper egestas est. Vivamus mollis augue id sodales dignissim.</p>

<p>Suspendisse potenti. Proin vestibulum ipsum a lectus sollicitudin aliquet. In accumsan tortor quis tempus commodo. Aliquam tempus imperdiet posuere. Sed ac congue massa. Vivamus dapibus ex id porta iaculis. Praesent ultrices, nisl ut faucibus imperdiet, leo sem scelerisque lorem, scelerisque imperdiet lacus elit vel risus. Nulla sed sem sapien. Fusce eget tempor orci. Donec eget scelerisque libero, nec rhoncus turpis. In felis ex, maximus vel elit sed, volutpat placerat erat. Nam consectetur sed nulla vel aliquet.</p>

<p>Maecenas euismod quam at nisi tincidunt fringilla. Aliquam vehicula, purus sit amet placerat euismod, odio mi vestibulum mi, a sagittis diam purus at nisl. Pellentesque semper sollicitudin dictum. Mauris eleifend augue augue, in eleifend augue efficitur eu. Quisque vestibulum placerat nunc ut scelerisque. Nulla a justo odio. Donec ullamcorper dolor vitae elit hendrerit tempus. Integer orci nulla, cursus quis blandit non, mollis eu purus. Vestibulum blandit mi vitae libero convallis, eget placerat tortor tincidunt.</p>

<p>Proin ac dapibus est. Suspendisse in quam egestas, posuere dolor sed, mollis lectus. Aenean risus lectus, placerat quis urna vel, vehicula vulputate nibh. Curabitur venenatis dapibus metus, non efficitur arcu aliquet vel. Nam rhoncus felis ac quam pellentesque, eu eleifend nisl tempor. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Phasellus ac turpis ut justo volutpat sodales. Integer venenatis dolor non quam ultricies dapibus. Duis pharetra sapien mi, quis finibus lorem mollis sit amet. Proin et sapien vel est auctor varius vel sit amet leo. Aenean cursus lacus quis varius maximus. Sed quis nunc sit amet eros tincidunt varius sed id neque. Duis risus dolor, ultricies ac sodales vitae, egestas gravida quam. Donec quis sollicitudin ante.</p>

<p>Nam ac dignissim velit. Aliquam a tortor tristique, vulputate nisi ac, sollicitudin massa. Vestibulum vitae nisl odio. Sed non magna ut arcu efficitur facilisis. Sed nec orci blandit, tincidunt sapien at, posuere nulla. Etiam ut elit nisl. Duis eu viverra eros. Curabitur vestibulum dapibus leo a euismod. Fusce sollicitudin blandit massa a posuere. Aenean convallis efficitur diam, ac sodales neque consectetur quis. Nulla efficitur sem quis massa porta porttitor. Pellentesque et luctus nibh. </p>
</div>
!

CSS 

              
                html, body{
	background-color:#F2F2F2;
	font-family:Segoe, "Segoe UI", "DejaVu Sans", "Trebuchet MS", Verdana, sans-serif;
	margin:0;
	padding:0;
	text-align:center;
	color:#404040;
	position:relative;
}

.go-top{
	display:block;
	width:40px;
	height:40px;
	line-height:35px;
	text-align:center;
	font-size:30px;
	position:fixed;
	bottom:-40px;
	right:20px;
	-webkit-transition: all 1s ease;
    -moz-transition: all 1s ease;
    -o-transition: all 1s ease;
    transition: all 1s ease;
	background-color:#404040;
	color:#FFFFFF;
	text-decoration:none;
	-moz-border-radius:5px;
	-webkit-border-radius:5px;
	border-radius:5px;
}

.go-top.show{
	bottom:20px;
}

.go-top:hover{
	background-color:#5DBA9D;
	color:#FFFFFF;
}

.wrapper{
	margin:auto;
	width:700px;
	text-align:left;
}
!

JS 

              
                /*Add class when scroll down*/
$(window).scroll(function(event){
  	var scroll = $(window).scrollTop();
    if (scroll >= 50) {
        $(".go-top").addClass("show");
    } else {
        $(".go-top").removeClass("show");
    }
});
/*Animation anchor*/
$('a').click(function(){
    $('html, body').animate({
        scrollTop: $( $(this).attr('href') ).offset().top
    }, 1000);
});
!
999px

Console