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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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CSS

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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

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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-.

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JavaScript

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

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HTML 

            
              <link href="https://fonts.googleapis.com/css?family=PT+Sans&display=swap" rel="stylesheet"> 


<link id="theme-id" class="syntax-js" rel="stylesheet" href="//cdn.jsdelivr.net/gh/highlightjs/cdn-release@9.15.10/build/styles/atom-one-light.min.css">

<body class="wrapper">
	<div class="header">
		<button class="toggle-button">
			<ion-icon id="dark-mode-icon" class="moon" name="moon"></ion-icon>
    	</button>
		<div class="code-toggles">
			<button class="toggle-button scss-tray-button">
			<ion-icon id="" class="sass" name="logo-sass"></ion-icon>
		</button>
			<button class="toggle-button css-tray-button">
			<ion-icon id="" class="css-icon " name="logo-css3"></ion-icon>
		</button>

		</div>

	</div>
	<div class="css-tray tray-toggle-hidden">
		<pre>
<code class=" code-output">

/* Global button properties */  
button {
    min-width: 150px;
    padding: 1rem;
    font-size: 16px;
    letter-spacing: 1px;
    border-width: 2px;
    border-radius: 0px;
    font-family: -apple-system, BlinkMacSystemFont, "Roboto", Helvetica Neue,
        Helvetica, Arial, sans-serif;
    transition: 0.2s;
    }
    /* Remove annoying default properties */
    button:focus { 
        outline: none;
    }
    button:active {
        border-style: solid;
    }

/* Individual border properties */
button.set-1 {
  border-width: 2px;
  border-style: solid;
  border-radius: 0px;
}

button.set-2 {
  border-width: 2px;
  border-style: solid;
  border-radius: 8px;
}

button.set-3 {
  border-width: 2px;
  border-style: solid;
  border-radius: 50px;
}

button.set-4 {
  border-width: 2px;
  border-style: solid;
  border-radius: 25% 10%;
}
/* Individual button colour properties --light mode */
.button.primary {
  color: #5183f5;
  border-color: #5183f5;
  background: #e2eafd;
}
.button.primary:hover {
  border-color: #5183f5;
  background: #b1c8fb;
}
.button.primary:active {
  border-color: #2161f2;
  background: #5183f5;
  color: white;
}
.button.secondary {
  color: #f59551;
  border-color: #f59551;
  background: #fdede2;
}
.button.secondary:hover {
  border-color: #f27821;
  background: #fbd0b1;
}
.button.secondary:active {
  border-color: #f27821;
  background: #f59551;
  color: white;
}
.button.success {
  color: #0cd498;
  border-color: #51f5c4;
  background: #e2fdf5;
}
.button.success:hover {
  border-color: #21f2b4;
  background: #b1fbe5;
}
.button.success:active {
  border-color: #21f2b4;
  background: #51f5c4;
  color: white;
}
.button.error {
  color: #f55169;
  border-color: #f55169;
  background: #fde2e6;
}
.button.error:hover {
  border-color: #f2213f;
  background: #fbb1bc;
}
.button.error:active {
  border-color: #f2213f;
  background: #f55169;
  color: white;
}
.button.warning {
  color: #f2b221;
  border-color: #f5c351;
  background: #fdf5e2;
}
.button.warning:hover {
  border-color: #f2b221;
  background: #fbe4b1;
}
.button.warning:active {
  border-color: #f2b221;
  background: #f5c351;
  color: white;
}
.button.neutral {
  color: #919191;
  border-color: #9e9e9e;
  background: #ebebeb;
}
.button.neutral:hover {
  border-color: #858585;
  background: #d1d1d1;
}
.button.neutral:active {
  border-color: #858585;
  background: #9e9e9e;
  color: white;
}

/* Individual button colour properties -- dark mode */
.dark .button.primary {
  color: #5183f5;
  border-color: #5183f5;
  background: transparent;
}
.dark .button.primary:hover {
  border-color: #5183f5;
  background: black;
}
.dark .button.primary:active {
  border-color: #0c49d4;
  background: black;
}
.dark .button.secondary {
  color: #f59551;
  border-color: #f59551;
  background: transparent;
}
.dark .button.secondary:hover {
  border-color: #f27821;
  background: #1d0d02;
}
.dark .button.secondary:active {
  border-color: #f27821;
  background: black;
}
.dark .button.success {
  color: #0cd498;
  border-color: #51f5c4;
  background: transparent;
}
.dark .button.success:hover {
  border-color: #21f2b4;
  background: #01130e;
}
.dark .button.success:active {
  border-color: #21f2b4;
  background: black;
}
.dark .button.error {
  color: #f55169;
  border-color: #f55169;
  background: transparent;
}
.dark .button.error:hover {
  border-color: #f2213f;
  background: #1d0206;
}
.dark .button.error:active {
  border-color: #f2213f;
  background: #090102;
}
.dark .button.warning {
  color: #f2b221;
  border-color: #f5c351;
  background: transparent;
}
.dark .button.warning:hover {
  border-color: #f2b221;
  background: #2b1f02;
}
.dark .button.warning:active {
  border-color: #f2b221;
  background: #130d01;
}
.dark .button.neutral {
  color: #919191;
  border-color: #9e9e9e;
  background: transparent;
}
.dark .button.neutral:hover {
  border-color: #858585;
  background: #1f1f1f;
}
.dark .button.neutral:active {
  border-color: #858585;
  background: #121212;
}
</code>
</pre>
	</div>
	<div class="scss-tray tray-toggle-hidden">
		<pre>
		<code class="code-output">
/* Variables */

// Button colours
$blue: #5183f5;
$red: #f55169;
$yellow: #f5c351;
$green: #51f5c4;
$orange: #f59551;
$grey: #9e9e9e;

/* Mixins */

// Remove defaults
@mixin purge-defaults {
	button {
		&:focus {
			outline: none;
		}
	}
}

// Global button properties
@mixin button-skeleton {
	min-width: 150px;
	padding: 1rem;
	font-size: 16px;
	letter-spacing: 1px;
}

// Colours
@mixin colours( $button-border-colour, $button-background-colour ) {
	border-color: $button-border-colour;
	background: $button-background-colour;
}

// Borders
@mixin button-borders( $width, $radius, $style ) {
	border-width: $width;
	border-style: $style;
	border-radius: $radius;
}

/* Application */

// Applying border radii 

// Squared

button.set-1 {
	@include button-borders(2px, 0px, solid);
}

// Rounded

button.set-2 {
	@include button-borders(2px, 8px, solid);
}

// Circular

button.set-3 {
	@include button-borders(2px, 50px, solid);
}

button.set-4 {
	@include button-borders(2px, 25% 10%, solid);
}


// Applying lightmode colours 
.button {
	@include button-skeleton;
	transition: 0.2s;
	&.primary {
		color: $blue;
		@include colours($blue, lighten($blue, 30%));
		&:hover {
			@include colours($blue, lighten($blue, 20%));
		}
		&:active {
			@include colours(darken($blue,10%), $blue);
			color: white;
		}
	}
	&.secondary {
		color: $orange;
		@include colours($orange, lighten($orange, 30%) );
		&:hover {
			@include colours(darken($orange,10%), lighten($orange, 20%) );
		}
		&:active {
			@include colours(darken($orange,10%), $orange);
			color: white;
		}
	}
	&.success {
		color: darken($green, 20%);
		@include colours($green, lighten($green, 30%) );
		&:hover {
			@include colours(darken($green,10%), lighten($green, 20%) );
		}
		&:active {
			@include colours(darken($green,10%), $green);
			color: white;
		}
	}
	&.error {
		color: $red;
		@include colours($red, lighten($red, 30%) );
		&:hover {
			@include colours(darken($red,10%), lighten($red, 20%) );
		}
		&:active {
			@include colours(darken($red,10%), $red);
			color: white;
		}
	}
	&.warning {
		color: darken($yellow, 10%);
		@include colours($yellow, lighten($yellow, 30%) );
		&:hover {
			@include colours(darken($yellow,10%), lighten($yellow, 20%) );
		}
		&:active {
			@include colours(darken($yellow,10%), $yellow);
			color: white;
		}
	}
	&.neutral {
		color: darken($grey, 5%);
		@include colours($grey, lighten($grey, 30%) );
		&:hover {
			@include colours(darken($grey,10%), lighten($grey, 20%) );
		}
		&:active {
			@include colours(darken($grey,10%), $grey);
			color: white;
		}
	}
}

// Applying dark mode colors 
.dark {
	background: #212121;
	color: #e0e0e0;
	.css-tray{
		background: transparent;
		color: #BDBDBD;

}
	.button {
		@include button-skeleton;
		transition: 0.2s;
		&.primary {
			color: $blue;
			@include colours($blue, transparent);
			&:hover {
				@include colours($blue, darken($blue, 80%));
			}
			&:active {
				@include colours(darken($blue,20%), darken($blue, 100%) );
				
			}
		}
		&.secondary {
			color: $orange;
			@include colours($orange, transparent);
			&:hover {
				@include colours(darken($orange,10%), darken($orange, 58%) );
			}
			&:active {
				@include colours(darken($orange,10%), darken($orange, 90%));
				
			}
		}
		&.success {
			color: darken($green, 20%);
			@include colours($green, transparent );
			&:hover {
				@include colours(darken($green,10%), darken($green, 60%) );
			}
			&:active {
				@include colours(darken($green,10%), darken($green, 100%));
				
			}
		}
		&.error {
			color: $red;
			@include colours($red, transparent );
			&:hover {
				@include colours(darken($red,10%), darken($red, 58%) );
			}
			&:active {
				@include colours(darken($red,10%), darken($red, 62%));
				
			}
		}
		&.warning {
			color: darken($yellow, 10%);
			@include colours($yellow, transparent );
			&:hover {
				@include colours(darken($yellow,10%), darken($yellow, 55%) );
			}
			&:active {
				@include colours(darken($yellow,10%), darken($yellow, 60%));
				
			}
		}
		&.neutral {
			color: darken($grey, 5%);
			@include colours($grey, transparent);
			&:hover {
				@include colours(darken($grey,10%), darken($grey, 50%) );
			}
			&:active {
				@include colours(darken($grey,10%), darken($grey, 55%));
			}
		}
	}
}


		</code>
	</pre>
	</div>
	<!-- Set One -->
	<div class="controls">
		<div class="title">
			<h2 style="text-align:center;letter-spacing: 1px;">
				Set 1 &middot; Squared
			</h2>
		</div>
	</div>

	<div class="grid set-one">
		<div class="cell">
			<button class="button  set-1 primary">Primary</button>
		</div>
		<div class="cell">
			<button class="button set-1 secondary">Secondary</button>
		</div>
		<div class="cell">
			<button class="button  set-1 success">Success</button>
		</div>
		<div class="cell">
			<button class="button set-1 error">Error</button>
		</div>
		<div class="cell">
			<button class="button set-1 warning">Warning</button>
		</div>
		<div class="cell">
			<button class="button set-1 neutral">Neutral</button>
		</div>
	</div>

	<!-- Set Two -->
	<div class="controls subsequent">
		<div class="title">
			<h2 style="text-align:center;letter-spacing: 1px;">
				Set 2 &middot; Rounded
			</h2>
		</div>
	</div>

	<div class="grid set-two">
		<div class="cell">
			<button class="button set-2 primary">Primary</button>
		</div>
		<div class="cell">
			<button class="button set-2 secondary">Secondary</button>
		</div>
		<div class="cell">
			<button class="button set-2 success">Success</button>
		</div>
		<div class="cell">
			<button class="button set-2 error">Error</button>
		</div>
		<div class="cell">
			<button class="button set-2 warning">Warning</button>
		</div>
		<div class="cell">
			<button class="button set-2 neutral">Neutral</button>
		</div>
	</div>

	<!-- Set Three -->
	<div class="controls subsequent">
		<div class="title">
			<h2 style="text-align:center;letter-spacing: 1px;">
				Set 3 &middot; Circular
			</h2>
		</div>
	</div>

	<div class="grid set-three">
		<div class="cell">
			<button class="button set-3 primary">Primary</button>
		</div>
		<div class="cell">
			<button class="button set-3 secondary">Secondary</button>
		</div>
		<div class="cell">
			<button class="button set-3 success">Success</button>
		</div>
		<div class="cell">
			<button class="button set-3 error">Error</button>
		</div>
		<div class="cell">
			<button class="button set-3 warning">Warning</button>
		</div>
		<div class="cell">
			<button class="button set-3 neutral">Neutral</button>
		</div>
	</div>

	<!-- Set Four -->
	<div class="controls subsequent">
		<div class="title">
			<h2 style="text-align:center;letter-spacing: 1px;">
				Set 4 &middot; Irregular
			</h2>
		</div>
	</div>
	</div>

	<div class="grid set-three">
		<div class="cell">
			<button class="button set-4 primary">Primary</button>
		</div>
		<div class="cell">
			<button class="button set-4 secondary">Secondary</button>
		</div>
		<div class="cell">
			<button class="button set-4 success">Success</button>
		</div>
		<div class="cell">
			<button class="button set-4 error">Error</button>
		</div>
		<div class="cell">
			<button class="button set-4 warning">Warning</button>
		</div>
		<div class="cell">
			<button class="button set-4 neutral">Neutral</button>
		</div>
	</div>
</body>
!

CSS 

            
              // ------------------------------------------------------------------------- //
/* Page layout & structuring */
/* Typography*/
body {
	font-family: 'PT Sans';
}

code,
pre {
	font-family: "Monoid", monospace;
	font-weight: normal;
}

.code-output,
.scss {
	font-size: 11px;
}

.wrapper {
	margin: 1rem;
	color: #404040;
}

.header {
	display: flex;
	justify-content: space-between;
	flex-direction: row;
}

// Controls
.controls {
	display: flex;
	flex-direction: row;
	justify-content: space-between;
	align-items: baseline;
	border-bottom: 2px dotted #404040;
	margin-bottom: 20px;
	&.subsequent {
		margin-top: 40px;
	}
}

.moon {
	color: #fbc02d;
	font-size: 28px;
}


.moon:active {
    font-size: 24px;
}

.moon:focus {
   font-size: 26px;
}

.sass {
	font-size: 28px;
	color: #ec407a;
}

.css-icon {
	color: #2979ff;
	font-size: 28px;
}

.emoji {
	font-size: 22px;
}

.toggle-button {
	background: transparent;
	box-shadow: none;
	outline: none;
	border: none;
	&:focus {
		outline: none;
	}
}

// CSS Output

.css-tray,
.scss-tray {
	background: transparent;
	height: 0px;
	opacity: 0;
	transition: all 0.4s ease;
	.code-output {
		display: none;
	}
}

.css-tray--active,
.scss-tray--active {
	height: 500px;
	margin-bottom: 50px;
	opacity: 1;
	overflow-y: scroll;
	height: 400px;
	display: block;
	.code-output {
		display: block;
	}
}

// Grid layout
.grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(180px, auto));
	grid-column-gap: 20px;
	grid-row-gap: 20px;
	justify-items: center;
}

// ------------------------------------------------------------------------- //
/* Button controls */

/* Global button properties */

// General colours

// Button Colours
$blue: #5183f5;
$red: #f55169;
$yellow: #f5c351;
$green: #51f5c4;
$orange: #f59551;
$grey: #9e9e9e;

// Positioning
@mixin positioning {
	display: flex;
}

// Remove defaults
@mixin purge-defaults {
	button {
		&:focus {
			outline: none;
			//shadow:none;
		}
	}
}

.cell {
	@include positioning;
	@include purge-defaults;
}

/* Local button properties -- Common */

// Basics
@mixin button-skeleton {
	min-width: 150px;
	padding: 1rem;
	font-size: 16px;
	letter-spacing: 1px;
	cursor: pointer;
}

// Colours
@mixin colours($button-border-colour, $button-background-colour) {
	border-color: $button-border-colour;
	background: $button-background-colour;
}

// Borders
@mixin button-borders($width, $radius, $style) {
	border-width: $width;
	border-style: $style;
	border-radius: $radius;
}

// Colours, applied

.button {
	font-family: "PT Sans";
	@include button-skeleton;
	transition: 0.2s;
	&.primary {
		color: $blue;
		@include colours($blue, lighten($blue, 30%));
		&:hover {
			@include colours($blue, lighten($blue, 20%));
		}
		&:active {
			@include colours(darken($blue,10%), $blue);
			color: white;
		}
	}
	&.secondary {
		color: $orange;
		@include colours($orange, lighten($orange, 30%) );
		&:hover {
			@include colours(darken($orange,10%), lighten($orange, 20%) );
		}
		&:active {
			@include colours(darken($orange,10%), $orange);
			color: white;
		}
	}
	&.success {
		color: darken($green, 20%);
		@include colours($green, lighten($green, 30%) );
		&:hover {
			@include colours(darken($green,10%), lighten($green, 20%) );
		}
		&:active {
			@include colours(darken($green,10%), $green);
			color: white;
		}
	}
	&.error {
		color: $red;
		@include colours($red, lighten($red, 30%) );
		&:hover {
			@include colours(darken($red,10%), lighten($red, 20%) );
		}
		&:active {
			@include colours(darken($red,10%), $red);
			color: white;
		}
	}
	&.warning {
		color: darken($yellow, 10%);
		@include colours($yellow, lighten($yellow, 30%) );
		&:hover {
			@include colours(darken($yellow,10%), lighten($yellow, 20%) );
		}
		&:active {
			@include colours(darken($yellow,10%), $yellow);
			color: white;
		}
	}
	&.neutral {
		color: darken($grey, 5%);
		@include colours($grey, lighten($grey, 30%) );
		&:hover {
			@include colours(darken($grey,10%), lighten($grey, 20%) );
		}
		&:active {
			@include colours(darken($grey,10%), $grey);
			color: white;
		}
	}
}

/* Local button properties -- Unique */

// Squared

button.set-1 {
	@include button-borders(2px, 0px, solid);
}

// Rounded

button.set-2 {
	@include button-borders(2px, 8px, solid);
}

// Circular

button.set-3 {
	@include button-borders(2px, 50px, solid);
}

button.set-4 {
	@include button-borders(2px, 25% 10%, solid);
}
// Dark styles

.dark {
	background: #212121;
	color: #e0e0e0;
	.css-tray {
		background: transparent;
		color: #bdbdbd;
	}
	.button {
		@include button-skeleton;
		transition: 0.2s;
		&.primary {
			color: $blue;
			@include colours($blue, transparent);
			&:hover {
				@include colours($blue, darken($blue, 80%));
			}
			&:active {
				@include colours(darken($blue,20%), darken($blue, 100%) );
			}
		}
		&.secondary {
			color: $orange;
			@include colours($orange, transparent);
			&:hover {
				@include colours(darken($orange,10%), darken($orange, 58%) );
			}
			&:active {
				@include colours(darken($orange,10%), darken($orange, 90%));
			}
		}
		&.success {
			color: darken($green, 20%);
			@include colours($green, transparent );
			&:hover {
				@include colours(darken($green,10%), darken($green, 60%) );
			}
			&:active {
				@include colours(darken($green,10%), darken($green, 100%));
			}
		}
		&.error {
			color: $red;
			@include colours($red, transparent );
			&:hover {
				@include colours(darken($red,10%), darken($red, 58%) );
			}
			&:active {
				@include colours(darken($red,10%), darken($red, 62%));
			}
		}
		&.warning {
			color: darken($yellow, 10%);
			@include colours($yellow, transparent );
			&:hover {
				@include colours(darken($yellow,10%), darken($yellow, 55%) );
			}
			&:active {
				@include colours(darken($yellow,10%), darken($yellow, 60%));
			}
		}
		&.neutral {
			color: darken($grey, 5%);
			@include colours($grey, transparent);
			&:hover {
				@include colours(darken($grey,10%), darken($grey, 50%) );
			}
			&:active {
				@include colours(darken($grey,10%), darken($grey, 55%));
			}
		}
	}
}
!

JS 

            
              var toggle = document.querySelector("button.toggle-button");
var wrapper = document.querySelector(".wrapper");
var darkModeIcon = document.getElementById("dark-mode-icon");
var themeID = document.getElementById("theme-id");
var theme = document.querySelector(".syntax-js");
var cssToggle = document.querySelector("button.css-tray-button");
var cssTray = document.querySelector("div.css-tray");
var scssTray = document.querySelector("div.scss-tray");
var scssToggle = document.querySelector("button.scss-tray-button");

function toggleClass() {
	wrapper.classList.toggle("dark");
	if (darkModeIcon.name == "moon") {
		darkModeIcon.name = "sunny";
	} else {
		darkModeIcon.name = "moon";
	}
}

function changeTheme() {
	if (darkModeIcon.name == "sunny") {
		themeID.href =
			"//cdn.jsdelivr.net/gh/highlightjs/cdn-release@9.15.10/build/styles/atom-one-dark.min.css";
	} else {
		themeID.href =
			"//cdn.jsdelivr.net/gh/highlightjs/cdn-release@9.15.10/build/styles/atom-one-light.min.css";
	}
}

// Toggle dark mode
function toggleDarkMode() {
	toggleClass();
	changeTheme();
}

toggle.addEventListener("click", toggleDarkMode);

// CSS tray controls

function opencloseSCSSTray() {
	scssTray.classList.toggle("scss-tray--active");
}

scssToggle.addEventListener("click", opencloseSCSSTray);

function opencloseCSSTray() {
	cssTray.classList.toggle("css-tray--active");
}

cssToggle.addEventListener("click", opencloseCSSTray);
!
999px

Console