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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.

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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.

Learn more · Versions

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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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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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 

              
                <body id="body" class="light-mode">
	
	  <button type="button" type="submit" name="dark_light" onclick="toggleDarkLight()" title="Toggle dark/light mode"></button>
	

<!-- Grid 2/3 and 1/3-->
		<div class="grid grid-pad">
			<div class="col-1-1">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- Grid 1/2 -->
		<div class="grid grid-pad">
			<div class="col-1-2 mobile-col-1-2">
				<div class="content">
										<p>Siquis enim militarium vel honoratorum aut nobilis inter suos rumore tenus esset insimulatus fovisse partes hostiles, iniecto onere catenarum in modum beluae trahebatur et inimico urgente vel nullo, quasi sufficiente hoc solo, quod nominatus esset aut delatus aut postulatus, capite vel multatione bonorum aut insulari solitudine damnabatur.</p>
				</div>
			</div>
			<div class="col-1-2 mobile-col-1-2">
				<div class="content">
										<p>Siquis enim militarium vel honoratorum aut nobilis inter suos rumore tenus esset insimulatus fovisse partes hostiles, iniecto onere catenarum in modum beluae trahebatur et inimico urgente vel nullo, quasi sufficiente hoc solo, quod nominatus esset aut delatus aut postulatus, capite vel multatione bonorum aut insulari solitudine damnabatur.</p>
				</div>
			</div>
			
			<div class="col-1-2 mobile-col-1-1">
				<div class="content">
				</div>
			</div>
			<div class="col-1-2 mobile-col-1-2 hide-on-mobile">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- Grid 1/3 -->
		<div class="grid grid-pad">
			<div class="col-1-3 mobile-col-1-3">
				<div class="content">
				</div>
			</div>
			<div class="col-1-3 mobile-col-1-3">
				<div class="content">
				</div>
			</div>
			<div class="col-1-3 mobile-col-1-3">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- Grid 1/3 -->
		<div class="grid grid-pad">
			<div class="col-1-3 mobile-col-1-3 push-1-3">
				<div class="content">
				</div>
			</div>
			<div class="col-1-3 mobile-col-1-3 push-1-3">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- Grid 1/4 -->
		<div class="grid grid-pad">
			<div class="col-1-4">
				<div class="content">
				</div>
			</div>
			<div class="col-1-4">
				<div class="content">
				</div>
			</div>
			<div class="col-1-4 hide-on-mobile">
				<div class="content">
				</div>
			</div>
			<div class="col-1-4 hide-on-mobile">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- Grid 1/5 -->
		<div class="grid grid-pad">
			<div class="col-1-5">
				<div class="content">
				</div>
			</div>
			<div class="col-1-5">
				<div class="content">
				</div>
			</div>
			<div class="col-1-5">
				<div class="content">
				</div>
			</div>
			<div class="col-1-5">
				<div class="content">
				</div>
			</div>
			<div class="col-1-5">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- Grid 1/6 -->
		<div class="grid grid-pad">
			<div class="col-1-6">
				<div class="content">
				</div>
			</div>
			<div class="col-1-6">
				<div class="content">
				</div>
			</div>
			<div class="col-1-6">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-6">
				<div class="content">
				</div>
			</div>
			<div class="col-1-6">
				<div class="content">
				</div>
			</div>
			<div class="col-1-6">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- Grid 1/7 -->
		<div class="grid grid-pad">
			<div class="col-1-7">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-7">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-7">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-7">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-7">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-7">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-7">
				<div class="content">
					
				</div>
			</div>
		</div>
		<!-- Grid 1/8 -->
		<div class="grid grid-pad">
			<div class="col-1-8">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-8">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-8">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-8">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-8">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-8">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-8">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-8">
				<div class="content">
					
				</div>
			</div>
		</div>
		<!-- Grid 1/9 -->
		<div class="grid grid-pad">
			<div class="col-1-9">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-9">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-9">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-9">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-9">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-9">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-9">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-9">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-9">
				<div class="content">
					
				</div>
			</div>
		</div>
		<!-- Grid 1/10 -->
		<div class="grid grid-pad">
			<div class="col-1-10">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-10">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-10">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-10">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-10">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-10">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-10">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-10">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-10">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-10">
				<div class="content">
					
				</div>
			</div>
		</div>
		<!-- Grid 1/11 -->
		<div class="grid grid-pad">
			<div class="col-1-11">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-11">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-11">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-11">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-11">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-11">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-11">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-11">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-11">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-11">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-11">
				<div class="content">
					
				</div>
			</div>
		</div>
		<!-- Grid 1/12 -->
		<div class="grid grid-pad">
			<div class="col-1-12">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-12">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-12">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-12">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-12">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-12">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-12">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-12">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-12">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-12">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-12">
				<div class="content">
					
				</div>
			</div>
			<div class="col-1-12">
				<div class="content">
					
				</div>
			</div>
		</div>
		<!-- 11/12 and 1/12 layout -->
		<div class="grid grid-pad">
			<div class="col-1-12">
				<div class="content">
				</div>
			</div>
			<div class="col-11-12">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- 10/12 and 2/12 layout -->
		<div class="grid grid-pad">
			<div class="col-2-12">
				<div class="content">
				</div>
			</div>
			<div class="col-10-12">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- 9/12 and 3/12 layout -->
		<div class="grid grid-pad">
			<div class="col-3-12">
				<div class="content">
				</div>
			</div>
			<div class="col-9-12">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- 8/12 and 4/12 layout -->
		<div class="grid grid-pad">
			<div class="col-4-12">
				<div class="content">
				</div>
			</div>
			<div class="col-8-12">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- 7/12 and 5/12 layout -->
		<div class="grid grid-pad">
			<div class="col-5-12">
				<div class="content">
				</div>
			</div>
			<div class="col-7-12">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- 6/12 and 6/12 layout -->
		<div class="grid grid-pad">
			<div class="col-6-12">
				<div class="content">
				</div>
			</div>
			<div class="col-6-12">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- 7/12 and 5/12 layout -->
		<div class="grid grid-pad">
			<div class="col-7-12">
				<div class="content">
				</div>
			</div>
			<div class="col-5-12">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- 8/12 and 4/12 layout -->
		<div class="grid grid-pad">
			<div class="col-8-12">
				<div class="content">
				</div>
			</div>
			<div class="col-4-12">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- 9/12 and 3/12 layout -->
		<div class="grid grid-pad">
			<div class="col-9-12">
				<div class="content">
				</div>
			</div>
			<div class="col-3-12">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- 10/12 and 2/12 layout -->
		<div class="grid grid-pad">
			<div class="col-10-12">
				<div class="content">
				</div>
			</div>
			<div class="col-2-12">
				<div class="content">
				</div>
			</div>
		</div>
		<!-- 11/12 and 1/12 layout -->
		<div class="grid grid-pad">
			<div class="col-11-12">
				<div class="content">
				</div>
			</div>
			<div class="col-1-12">
				<div class="content">
				</div>
			</div>
		</div>
	
</body>
!

CSS 

              
                /*DARK MODE*/
body.dark-mode {
  background-color: #111;
  color: #eee;
}
body.dark-mode a {
  color: #111;
}
body.dark-mode button {
	background:url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/265602/moon.svg) no-repeat;
	background-size: contain;
	background-color: #eee;
	width: 25px;
	height: 25px;
	border: none;
	cursor: pointer;
	border-radius: 50%;
}

body.dark-mode .content {
	background: white;
	padding: 10px;
}

body.dark-mode p {
	color: black;
}
/*DARK MODE*/


/*LIGHT MODE*/
body.light-mode {
  background-color: #eee;
  color: #111;
}
body.light-mode a {
  color: #111;
}
body.light-mode button {
	background:url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/265602/moon.svg) no-repeat;
	background-size: contain;
	border-radius: 50%;
		width: 25px;
	height: 25px;
	border: none;
	cursor: pointer;
}

body.light-mode .content {
	background: #bbb;
	padding: 10px;
}

body.light-mode p {
	color: blue;
}
/*LIGHT MODE*/


p {
	font-family: 'Raleway', sans-serif;
}



/*
.content {
	background: #ccc;
	padding: 10px;
}
*/


/*SIMPLE GRID*/

[class*='grid'],
[class*='col-'],
[class*='mobile-'],
.grid:after {
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;	
}

[class*='col-'] {
	float: left;
  	min-height: 1px;
	padding-right: 20px; /* column-space */
}

[class*='col-'] [class*='col-']:last-child {
	padding-right: 0;
}

.grid {
	width: 100%;
	max-width: 1560px; /*1140px*/
	min-width: 748px; /* when using padded grid on ipad in portrait mode, width should be viewport-width - padding = (768 - 20) = 748. actually, it should be even smaller to allow for padding of grid containing element */
	margin: 0 auto;
	overflow: hidden;
}

.grid:after {
	content: "";
	display: table;
	clear: both;
}

.grid-pad {
	padding-top: 20px;
	padding-left: 20px; /* grid-space to left */
	padding-right: 0; /* grid-space to right: (grid-space-left - column-space) e.g. 20px-20px=0 */
}

.push-right {
	float: right;
}

/* Content Columns */

.col-1-1 {
	width: 100%;
}
.col-2-3, .col-8-12 {
	width: 66.66%;
}

.col-1-2, .col-6-12 {
	width: 50%;
}

.col-1-3, .col-4-12 {
	width: 33.33%;
}

.col-1-4, .col-3-12 {
	width: 25%;
}

.col-1-5 {
	width: 20%;
}

.col-1-6, .col-2-12 {
	width: 16.667%;
}

.col-1-7 {
	width: 14.28%;
}

.col-1-8 {
	width: 12.5%;
}

.col-1-9 {
	width: 11.1%;
}

.col-1-10 {
	width: 10%;
}

.col-1-11 {
	width: 9.09%;
}

.col-1-12 {
	width: 8.33%
}

/* Layout Columns */

.col-11-12 {
	width: 91.66%
}

.col-10-12 {
	width: 83.333%;
}

.col-9-12 {
	width: 75%;
}

.col-5-12 {
	width: 41.66%;
}

.col-7-12 {
	width: 58.33%
}

/* Pushing blocks */

.push-2-3, .push-8-12 {
	margin-left: 66.66%;
}

.push-1-2, .push-6-12 {
	margin-left: 50%;
}

.push-1-3, .push-4-12 {
	margin-left: 33.33%;
}

.push-1-4, .push-3-12 {
	margin-left: 25%;
}

.push-1-5 {
	margin-left: 20%;
}

.push-1-6, .push-2-12 {
	margin-left: 16.667%;
}

.push-1-7 {
	margin-left: 14.28%;
}

.push-1-8 {
	margin-left: 12.5%;
}

.push-1-9 {
	margin-left: 11.1%;
}

.push-1-10 {
	margin-left: 10%;
}

.push-1-11 {
	margin-left: 9.09%;
}

.push-1-12 {
	margin-left: 8.33%
}

@media handheld, only screen and (max-width: 767px) {
	.grid {
		width: 100%;
		min-width: 0;
		margin-left: 0;
		margin-right: 0;
		padding-left: 20px; /* grid-space to left */
		padding-right: 10px; /* grid-space to right: (grid-space-left - column-space) e.g. 20px-10px=10px */
	}

	[class*='col-'] {
		width: auto;
		float: none;
		margin: 10px 0;
		padding-left: 0;
		padding-right: 10px; /* column-space */
	}

	[class*='col-'] [class*='col-'] {
		padding-right: 0;
	}

	/* Mobile Layout */

	[class*='mobile-col-'] {
		float: left;
		margin: 0 0 10px;
		padding-left: 0;
		padding-right: 10px; /* column-space */
		padding-bottom: 0;
	}

	.mobile-col-1-1 {
		width: 100%;
	}
	.mobile-col-2-3, .mobile-col-8-12 {
		width: 66.66%;
	}

	.mobile-col-1-2, .mobile-col-6-12 {
		width: 50%;
	}

	.mobile-col-1-3, .mobile-col-4-12 {
		width: 33.33%;
	}

	.mobile-col-1-4, .mobile-col-3-12 {
		width: 25%;
	}

	.mobile-col-1-5 {
		width: 20%;
	}

	.mobile-col-1-6, .mobile-col-2-12 {
		width: 16.667%;
	}

	.mobile-col-1-7 {
		width: 14.28%;
	}

	.mobile-col-1-8 {
		width: 12.5%;
	}

	.mobile-col-1-9 {
		width: 11.1%;
	}

	.mobile-col-1-10 {
		width: 10%;
	}

	.mobile-col-1-11 {
		width: 9.09%;
	}

	.mobile-col-1-12 {
		width: 8.33%
	}

	/* Layout Columns */

	.mobile-col-11-12 {
		width: 91.66%
	}

	.mobile-col-10-12 {
		width: 83.333%;
	}

	.mobile-col-9-12 {
		width: 75%;
	}

	.mobile-col-5-12 {
		width: 41.66%;
	}

	.mobile-col-7-12 {
		width: 58.33%
	}

	.hide-on-mobile {
		display: none !important;
		width: 0;
		height: 0;
	}
}
!

JS 

              
                function toggleDarkLight() {
  var body = document.getElementById("body");
  var currentClass = body.className;
  body.className = currentClass == "dark-mode" ? "light-mode" : "dark-mode";
}
!
999px

Console