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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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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).

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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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HTML 

              
                <!-- Masthead -->
<header class="masthead">

	<div class="boards-menu">

		<button class="boards-btn btn"><i class="fab fa-trello boards-btn-icon"></i>Boards</button>

		<div class="board-search">
			<input type="search" class="board-search-input" aria-label="Board Search">
			<i class="fas fa-search search-icon" aria-hidden="true"></i>
		</div>

	</div>

	<div class="logo">

		<h1><i class="fab fa-trello logo-icon" aria-hidden="true"></i>Trello</h1>

	</div>

	<div class="user-settings">

		<button class="user-settings-btn btn" aria-label="Create">
			<i class="fas fa-plus" aria-hidden="true"></i>
		</button>

		<button class="user-settings-btn btn" aria-label="Information">
			<i class="fas fa-info-circle" aria-hidden="true"></i>
		</button>

		<button class="user-settings-btn btn" aria-label="Notifications">
			<i class="fas fa-bell" aria-hidden="true"></i>
		</button>

		<button class="user-settings-btn btn" aria-label="User Settings">
			<i class="fas fa-user-circle" aria-hidden="true"></i>
		</button>

	</div>

</header>
<!-- End of masthead -->


<!-- Board info bar -->
<section class="board-info-bar">

	<div class="board-controls">

		<button class="board-title btn">
			<h2>Web Development</h2>
		</button>

		<button class="star-btn btn" aria-label="Star Board">
			<i class="far fa-star" aria-hidden="true"></i>
		</button>

		<button class="personal-btn btn">Personal</button>

		<button class="private-btn btn"><i class="fas fa-briefcase private-btn-icon" aria-hidden="true"></i>Private</button>

	</div>

	<button class="menu-btn btn"><i class="fas fa-ellipsis-h menu-btn-icon" aria-hidden="true"></i>Show Menu</button>

</section>
<!-- End of board info bar -->

<!-- Lists container -->
<section class="lists-container">

	<div class="list">

		<h3 class="list-title">Tasks to Do</h3>

		<ul class="list-items">
			<li>Complete mock-up for client website</li>
			<li>Email mock-up to client for feedback</li>
			<li>Update personal website header background image</li>
			<li>Update personal website heading fonts</li>
			<li>Add google map to personal website</li>
			<li>Begin draft of CSS Grid article</li>
			<li>Read new CSS-Tricks articles</li>
			<li>Read new Smashing Magazine articles</li>
			<li>Read other bookmarked articles</li>
			<li>Look through portfolios to gather inspiration</li>
			<li>Create something cool for CodePen</li>
			<li>Post latest CodePen work on Twitter</li>
			<li>Listen to new Syntax.fm episode</li>
			<li>Listen to new CodePen Radio episode</li>
		</ul>

		<button class="add-card-btn btn">Add a card</button>

	</div>

	<div class="list">

		<h3 class="list-title">Completed Tasks</h3>

		<ul class="list-items">
			<li>Clear email inbox</li>
			<li>Finalise requirements for client web design</li>
			<li>Begin work on mock-up for client website</li>
		</ul>

		<button class="add-card-btn btn">Add a card</button>

	</div>

	<div class="list">

		<h3 class="list-title">Topics/Concepts to Revise</h3>

		<ul class="list-items">
			<li>HTML Elements</li>
			<li>HTML Form Validation</li>
			<li>HTML Structured Data</li>
			<li>Advanced CSS Selectors</li>
			<li>CSS Transforms</li>
			<li>CSS Animations</li>
			<li>CSS Flexbox</li>
			<li>CSS Grid</li>
			<li>CSS Methodologies (BEM, SMACSS etc.)</li>
			<li>SASS/SCSS</li>
			<li>Layout Fallbacks</li>
			<li>Responsive Design</li>
			<li>Design Patterns</li>
			<li>JavaScript Fundamentals</li>
			<li>JavaScript OOP</li>
			<li>JavaScript DOM Manipulation</li>
			<li>JavaScript Debugging Techniques</li>
			<li>Node Package Manager</li>
			<li>Grunt/Gulp</li>
			<li>GitHub</li>
			<li>Git Commands</li>
			<li>Web Accessibility</li>
			<li>Web Performance</li>
			<li>Web Hosting</li>
			<li>Browser Dev Tools</li>
			<li>Google Analytics</li>
			<li>Basic Photoshop/Sketch Usage</li>
		</ul>

		<button class="add-card-btn btn">Add a card</button>

	</div>

	<div class="list">

		<h3 class="list-title">Topics/Concepts to Learn</h3>

		<ul class="list-items">
			<li>HTML 5.2 New Features</li>
			<li>Responsive Images (picture element, srcset/sizes etc.)</li>
			<li>Serverless</li>
			<li>Variable Fonts</li>
			<li>Shadow DOM</li>
			<li>ES6+</li>
			<li>JSON & AJAX</li>
			<li>API's</li>
			<li>JavaScript Patterns</li>
			<li>JavaScript Testing</li>
			<li>jQuery</li>
			<li>SVG</li>
			<li>React JS</li>
			<li>Angular JS</li>
			<li>TypeScript</li>
			<li>Vue JS</li>
			<li>Node JS</li>
			<li>Webpack</li>
			<li>SEO Techniques</li>
			<li>HTML Emails</li>
			<li>WordPress</li>
			<li>Static Site Generators (Jekyll, Hugo, Gatsby etc.)</li>
		</ul>

		<button class="add-card-btn btn">Add a card</button>

	</div>

	<div class="list">

		<h3 class="list-title">Useful Websites for Learning</h3>

		<ul class="list-items">
			<li>Code Academy</li>
			<li>CodePen</li>
			<li>Codrops</li>
			<li>CSS-Tricks</li>
			<li>Free Code Camp</li>
			<li>Khan Academy</li>
			<li>Lynda</li>
			<li>Medium</li>
			<li>Mozilla Developer Network</li>
			<li>Stack Overflow</li>
			<li>Team Treehouse</li>
			<li>Tuts Plus</li>
			<li>Udemy</li>
			<li>WPSessions</li>
			<li>YouTube</li>
		</ul>

		<button class="add-card-btn btn">Add a card</button>

	</div>

	<div class="list">

		<h3 class="list-title">Web Dev YouTube Channels</h3>

		<ul class="list-items">
			<li>Adam Khoury</li>
			<li>Brad Hussey</li>
			<li>CSS-Tricks (Chris Coyier)</li>
			<li>Derek Banas</li>
			<li>DevTips (Travis Neilson)</li>
			<li>Free Code Camp</li>
			<li>Fun Fun Function (Mattias Petter Johansson)</li>
			<li>Google Chrome Developers</li>
			<li>Layout Land (Jen Simmons)</li>
			<li>Learn Code Academy</li>
			<li>Level Up Tuts (Scott Tolinski)</li>
			<li>Mackenzie Child</li>
			<li>Rachel Andrew</li>
			<li>The Net Ninja (Shaun Pelling)</li>
			<li>The New Boston (Bucky Roberts)</li>
			<li>Traversy Media (Brad Traversy)</li>
			<li>Wes Bos</li>
		</ul>

		<button class="add-card-btn btn">Add a card</button>

	</div>

	<div class="list">

		<h3 class="list-title">CodePen Ideas</h3>

		<ul class="list-items">
			<li>Something cool with CSS Grid</li>
			<li>Something cool with CSS Flexbox</li>
			<li>Something cool with CSS animations</li>
			<li>Something cool with CSS gradients</li>
			<li>Something cool with CSS pseudo-elements</li>
			<li>Something cool with SVG</li>
			<li>Something cool with JavaScript</li>
			<li>Something cool with all of the above</li>
		</ul>

		<button class="add-card-btn btn">Add a card</button>

	</div>

	<div class="list">

		<h3 class="list-title">Practise Website Ideas</h3>

		<ul class="list-items">
			<li>Airsoft/Paintballing Centre</li>
			<li>Bar/Pub</li>
			<li>Bicycle Shop/Repair</li>
			<li>Cafe/Coffee Shop</li>
			<li>Car Showroom/Garage/Repair/Parts</li>
			<li>Construction Company</li>
			<li>Fitness/Gym/Leisure Centre</li>
			<li>Nightclub</li>
			<li>Party Planning Company</li>
			<li>PC Build/Repair Service</li>
			<li>Portfolio/CV</li>
			<li>Real Estate/AirBnB</li>
			<li>Restaurant</li>
			<li>Skiing/Snowboarding Centre/Company</li>
			<li>Streaming Service for Movies/TV</li>
			<li>Streaming Service for Video Games</li>
			<li>Taxi Service</li>
			<li>Travel Agency</li>
			<li>Zoo/Safari Park</li>
		</ul>

		<button class="add-card-btn btn">Add a card</button>

	</div>

	<div class="list">

		<h3 class="list-title">JavaScript Project Ideas</h3>

		<ul class="list-items">
			<li>Analog Clock</li>
			<li>Basic Quiz</li>
			<li>Bill/Cost Splitter</li>
			<li>Countdown Timer</li>
			<li>Form Validator</li>
			<li>Geolocation (Find places near you etc.)</li>
			<li>Gif Search</li>
			<li>Note Taking App</li>
			<li>Random Name Picker</li>
			<li>Secret Message Encoder/Decoder</li>
			<li>Sortable Image Gallery</li>
			<li>Sortable Table</li>
			<li>Tip Calculator</li>
			<li>To-Do List</li>
			<li>Unit Converter</li>
		</ul>

		<button class="add-card-btn btn">Add a card</button>

	</div>

	<button class="add-list-btn btn">Add a list</button>

</section>
<!-- End of lists container -->
!

CSS 

              
                /*

All grid code is placed in a 'supports' rule (feature query) at the bottom of the CSS (Line 320). 
            
The 'supports' rule will only run if your browser supports CSS grid.

Flexbox is used as a fallback so that browsers which don't support grid will still recieve an identical layout.

*/

/* Base styles */

:root {
    font-size: 10px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    background-color: #0079bf;
}

.btn {
    display: flex;
    justify-content: center;
    align-items: center;
    font: inherit;
    background: none;
    border: none;
    color: inherit;
    padding: 0;
    cursor: pointer;
}

:focus {
    outline-color: #fa0;
}

/* Masthead */

.masthead {
    flex-basis: 4rem;
    display: flex;
    align-items: center;
    padding: 0 0.8rem;
    background-color: #0067a3;
    box-shadow: 0 0.1rem 0.1rem rgba(0, 0, 0, 0.1);
}

.masthead .btn {
    background-color: #4c94be;
    border-radius: 0.3rem;
    transition: background-color 150ms;
}

.masthead .btn:hover {
    background-color: #3385b5;
}

.boards-menu {
    display: flex;
    flex-shrink: 0;
}

.boards-btn {
    flex-basis: 9rem;
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
    margin-right: 0.8rem;
    padding: 0.6rem 0.8rem;
}

.boards-btn-icon {
    font-size: 1.7rem;
    padding-right: 1.2rem;
}

.board-search {
    flex-basis: 18rem;
    position: relative;
}

.board-search-input {
    height: 3rem;
    border: none;
    border-radius: 0.3rem;
    background-color: #4c94be;
    width: 100%;
    padding: 0 3rem 0 1rem;
    color: #fff;
}

.board-search-input:hover {
    background-color: #66a4c8;
}

.search-icon {
    font-size: 1.5rem;
    position: absolute;
    top: 50%;
    right: 0.8rem;
    transform: translateY(-50%) rotate(90deg);
    color: #fff;
}

.logo {
    flex: 1;
    font-family: "Courgette", cursive;
    font-size: 2.2rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.5);
    margin: 0 2rem;
    transition: color 150ms;
    text-align: center;
    white-space: nowrap;
    cursor: pointer;
}

.logo:hover {
    color: rgba(255, 255, 255, 0.8);
}

.logo-icon {
    padding-right: 0.4rem;
}

.user-settings {
    display: flex;
    height: 3rem;
    color: #fff;
}

.user-settings-btn {
    font-size: 1.5rem;
    width: 3rem;
    margin-right: 0.8rem;
}

.user-settings-btn:last-of-type {
    margin-right: 0;
}

/* Board info bar */

.board-info-bar {
    flex-basis: 3rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 0.8rem 0;
    padding: 0 1rem;
    color: #f6f6f6;
}

.board-controls {
    display: flex;
}

.board-controls .btn {
    margin-right: 1rem;
}

.board-controls .btn:last-of-type {
    margin-right: 0;
}

.board-info-bar .btn {
    font-size: 1.4rem;
    font-weight: 400;
    transition: background-color 150ms;
    padding: 0 0.6rem;
    border-radius: 0.3rem;
    height: 3rem;
}

.board-info-bar .btn:hover {
    background-color: #006aa8;
}

.private-btn-icon,
.menu-btn-icon {
    padding-right: 0.6rem;
    white-space: nowrap;
}

.board-title h2 {
    font-size: 1.8rem;
    font-weight: 700;
    white-space: nowrap;
}

/* Lists */

.lists-container::-webkit-scrollbar {
    height: 2.4rem;
}

.lists-container::-webkit-scrollbar-thumb {
    background-color: #66a3c7;
    border: 0.8rem solid #0079bf;
    border-top-width: 0;
}

.lists-container {
    display: flex;
    align-items: start;
    padding: 0 0.8rem 0.8rem;
    overflow-x: auto;
    height: calc(100vh - 8.6rem);
}

.list {
    flex: 0 0 27rem;
    display: flex;
    flex-direction: column;
    background-color: #e2e4e6;
    max-height: calc(100vh - 11.8rem);
    border-radius: 0.3rem;
    margin-right: 1rem;
}

.list-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: #333;
    padding: 1rem;
}

.list-items {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-content: start;
    padding: 0 0.6rem 0.5rem;
    overflow-y: auto;
}

.list-items::-webkit-scrollbar {
    width: 1.6rem;
}

.list-items::-webkit-scrollbar-thumb {
    background-color: #c4c9cc;
    border-right: 0.6rem solid #e2e4e6;
}

.list-items li {
    font-size: 1.4rem;
    font-weight: 400;
    line-height: 1.3;
    background-color: #fff;
    padding: 0.65rem 0.6rem;
    color: #4d4d4d;
    border-bottom: 0.1rem solid #ccc;
    border-radius: 0.3rem;
    margin-bottom: 0.6rem;
    word-wrap: break-word;
    cursor: pointer;
}

.list-items li:last-of-type {
    margin-bottom: 0;
}

.list-items li:hover {
    background-color: #eee;
}

.add-card-btn {
    display: block;
    font-size: 1.4rem;
    font-weight: 400;
    color: #838c91;
    padding: 1rem;
    text-align: left;
    cursor: pointer;
}

.add-card-btn:hover {
    background-color: #cdd2d4;
    color: #4d4d4d;
    text-decoration: underline;
}

.add-list-btn {
    flex: 0 0 27rem;
    display: block;
    font-size: 1.4rem;
    font-weight: 400;
    background-color: #006aa7;
    color: #a5cae0;
    padding: 1rem;
    border-radius: 0.3rem;
    cursor: pointer;
    transition: background-color 150ms;
    text-align: left;
}

.add-list-btn:hover {
    background-color: #005485;
}

.add-card-btn::after,
.add-list-btn::after {
    content: '...';
}

/*

The following rule will only run if your browser supports CSS grid.

Remove or comment-out the code block below to see how the browser will fall-back to flexbox styling. 

*/

@supports (display: grid) {
    body {
        display: grid;
        grid-template-rows: 4rem 3rem auto;
        grid-row-gap: 0.8rem;
    }

    .masthead {
        display: grid;
        grid-template-columns: auto 1fr auto;
        grid-column-gap: 2rem;
    }

    .boards-menu {
        display: grid;
        grid-template-columns: 9rem 18rem;
        grid-column-gap: 0.8rem;
    }

    .user-settings {
        display: grid;
        grid-template-columns: repeat(4, auto);
        grid-column-gap: 0.8rem;
    }

    .board-controls {
        display: grid;
        grid-auto-flow: column;
        grid-column-gap: 1rem;
    }

    .lists-container {
        display: grid;
        grid-auto-columns: 27rem;
        grid-auto-flow: column;
        grid-column-gap: 1rem;
    }

    .list {
        display: grid;
        grid-template-rows: auto minmax(auto, 1fr) auto;
    }

    .list-items {
        display: grid;
        grid-row-gap: 0.6rem;
    }

    .logo,
    .list,
    .list-items li,
    .boards-btn,
    .board-info-bar,
    .board-controls .btn,
    .user-settings-btn {
        margin: 0;
    }
}
!

JS 

              
                /*

Full-page view:

https://codepen.io/GeorgePark/full/bLLzJK/

*/
!
999px

Console