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HTML

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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

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About the <head>

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Insecure Resource

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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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If the stylesheet you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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About External Resources

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

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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HTML 

              
                <a href="#" class='btn open-modal' data-modal="#modal1">Open Modal</a>

<div class='modal' id='modal1'>
	<div class='content'>
		<h1 class='title'>This is a modal</h1>
		<p>
				Here is some text and stuff. cool cool	
		</p>
		<a class='btn close-modal' data-modal="#modal1" href="#">K Bye</a>
	</div>	
</div>
!

CSS 

              
                $red: #EF233C
$blue: #2B2D42
$orange: #FF9F1C

*
	box-sizing: border-box

body
	font-family: 'Nunito', sans-serif
	min-height: 100vh
	display: flex
	justify-content: center
	align-items: center

.btn
	padding: 20px 50px
	display: inline-block
	background: $red
	color: white
	text-decoration: none
	transition: 0.35s ease-in-out
	font-weight: 700
	&:hover
		background: darken($red, 7.5%)

.overlay
	width: 100%
	min-height: 100vh
	display: flex
	justify-content: center
	align-items: center
	flex-direction: column
	padding: 40px
	position: fixed
	top: 0
	left: 0
	background: rgba(black, 0.75)
	opacity: 0
	pointer-events: none
	transition: 0.35s ease-in-out
	max-height: 100vh
	overflow-y: auto
	&.open
		opacity: 1
		pointer-events: inherit
	.modal
		background: white
		text-align: center
		padding: 40px 80px
		box-shadow: 0px 1px 10px rgba(white, 0.35)
		opacity: 0
		pointer-events: none
		transition: 0.35s ease-in-out
		max-height: 100vh
		overflow-y: auto
		&.open
			opacity: 1
			pointer-events: inherit
			.content
				transform: translate(0, -0px)
				opacity: 1
		.content
			transform: translate(0, -10px)
			opacity: 0
			transition: .35s ease-in-out
		.title
			margin-top: 0
!

JS 

              
                $(".modal").each( function(){
	$(this).wrap('<div class="overlay"></div>')
});

$(".open-modal").on('click', function(e){
	e.preventDefault();
	e.stopImmediatePropagation;
	
	var $this = $(this),
			modal = $($this).data("modal");
	
	$(modal).parents(".overlay").addClass("open");
	setTimeout( function(){
		$(modal).addClass("open");
	}, 350);
	
	$(document).on('click', function(e){
		var target = $(e.target);
		
		if ($(target).hasClass("overlay")){
			$(target).find(".modal").each( function(){
				$(this).removeClass("open");
			});
			setTimeout( function(){
				$(target).removeClass("open");
			}, 350);
		}
		
	});
	
});

$(".close-modal").on('click', function(e){
	e.preventDefault();
	e.stopImmediatePropagation;
	
	var $this = $(this),
			modal = $($this).data("modal");
	
	$(modal).removeClass("open");
	setTimeout( function(){	
		$(modal).parents(".overlay").removeClass("open");
	}, 350);
	
});
!
999px

Console