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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>

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

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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

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                .oop

.header
	h1.heading Pure CSS Navigation
		br
		small Simple & Easy, Scroll down to view

.mobile
	.mobile-body
		.navbar
			div.logo
				a(href="#") Grey Shades
			button(type="button", class="burger")
				span
				span
				span
			
			ul.menu
				li Home
				li Work
				li About
				li Contact Me
				
		.container
				
			h2 The Elephant Rope
			
			p As a man was passing the elephants, he suddenly stopped, confused by the fact that these huge creatures were being held by only a small rope tied to their front leg. No chains, no cages. It was obvious that the elephants could, at anytime, break away from their bonds but for some reason, they did not.

			p He saw a trainer nearby and asked why these animals just stood there and made no attempt to get away. “Well,” trainer said, “when they are very young and much smaller we use the same size rope to tie them and, at that age, it’s enough to hold them. As they grow up, they are conditioned to believe they cannot break away. They believe the rope can still hold them, so they never try to break free.”

			p The man was amazed. These animals could at any time break free from their bonds but because they believed they couldn’t, they were stuck right where they were.

			p Like the elephants, how many of us go through life hanging onto a belief that we cannot do something, simply because we failed at it once before?

			p Failure is part of learning; we should never give up the struggle in life.
!

CSS 

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

@import url('https://fonts.googleapis.com/css?family=Inconsolata');

body {
	font-family: "Inconsolata", sans-serif;
	font-size: 14px;
	padding: 0 0 40px 0;
	margin: 0;
}

.mobile {
	width: 2.35in;
	height: 4.87in;
	margin: 0 auto;
	background: #222;
	border-radius: 25px;
	padding: 50px 5px;
	box-shadow: 0px 30px 40px rgba(0,0,0,0.2);
	
	.mobile-body {
		background: #fff;
		height: 100%;
		padding-top: 40px;
		// box-shadow: inset 0px 0px 2px rgba(0,0,0,1);
		border-radius: 4px;
		position: relative;
	}
}

.container {
	overflow-y: scroll;
	height: 327px;
	padding: 5px;
	background: #f6f6f6;
	line-height: 1.4;
	
	&::-webkit-scrollbar {
		width: 5px;
	}

	&::-webkit-scrollbar-track {
		-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3); 
		border-radius: 10px;
	}

	&::-webkit-scrollbar-thumb {
		border-radius: 10px;
		-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.5); 
	}
}

// no of use
.oop {
	position: relative;
	z-index: auto;
	height: 10px;
	background: linear-gradient(141deg, #48ded4 0%, #a026bf 51%, #e82c75 75%);
	margin-bottom: 20px;
}

.header {
	height: 100vh;
	display: table;
	width: 100%;
}

.heading {
	display: table-cell;
	vertical-align: middle;
	font-size: 2.3em;
	letter-spacing: 5px;
	text-align: center;
	font-weight: 200;
	text-transform: uppercase;
	color: #333;
	position: relative;
	
	small {
		font-size: 50%;
	}
}

// navbar styles

.navbar {
	background: #fff;
	border-radius: 4px;
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	box-shadow: 0px 1px 6px rgba(0,0,0,0.2);
	width: 100%;
	
	.logo {
		padding: 12px 5px 12px 35px;
		
		a {
			text-decoration: none;
			color: #333;
			font-size: 1em;
		}
	}
	 
	// instead button you can use checkbox to toggle menu with same click. I'm using button focus state to open the menu.
	
	button.burger {
		position: absolute;
		left: 0;
		top: 0;
		border: 0;
		background: transparent;
		padding: 8px 15px;
		pointer: cursor;
		outline: none;
		span {
			display: block;
			width: 4px;
			height: 4px;
			background: #000;
			margin: 3px 0;
			border-radius: 4px;
			transition: all .4s ease-in-out;
		}
		
		// Rotate first and last span
		
		&:focus {
			span:first-child {
				transform-origin: 2px 9px;
				transform: rotate(-90deg);
			}
			span:last-child {
				transform-origin: 2px -5px;
    			transform: rotate(-90deg);
			}
		}
		
		&:focus + ul {
			max-height: 500px;
		}
	}
	
	// nav menu
	
	ul.menu {
		list-style: none;
		padding: 0;
		margin: 0;
		overflow: hidden;
		max-height: 0;
		transition: all 0.6s ease-in-out;
		
		> li {
			display: block;
			padding: 10px 15px;
			transition: all 0.2s ease;
			
			&:hover {
				background: linear-gradient(141deg, #48ded4 0%, #a026bf 51%, #e82c75 75%);
				color: #fff;
			}
		}
	}
}

// feel free to modify. Thanks for watching :)
!

JS 

              
                // no JS
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999px

Console