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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

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>

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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-.

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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 

              
                <header>
		<nav id="main-navbar" class="navbar navbar-default navbar-fixed-top">
			<div class="container navbar-container">
				<div class="navbar-header">
					<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
						<span class="sr-only">Toggle navigation</span>
						<span class="icon-bar"></span>
						<span class="icon-bar"></span>
						<span class="icon-bar"></span>
					</button>
					<a class="navbar-brand" href="#">Logo</a>
				</div>
				<div id="navbar" class="navbar-collapse collapse">
					<ul class="nav navbar-nav navbar-right">
						<li><a href="#">Home</a></li>
						<li><a href="#about">About</a></li>
						<li><a href="#portfolio">Portfolio</a></li>
						<li><a href="#contact">Contact</a></li>
						<li><a href="#blog">Blog</a></li>
						</li>
					</ul>
				</div>
				<div class="top-social">
					<ul id="top-social-menu">
						<li><a href="#"><i class="fa fa-twitter"></i></a></li>
						<li><a href="#"><i class="fa fa-facebook"></i></a></li>
						<li><a href="#">Register</a></li>
						<li><a href="#">Careers</a></li>
					</ul>
				</div>
			</div>
		</nav>
	</header>

	<section class="full-width-img">
		<div class="container">
			<div class="box">
				<ul class="subheading-text">
					<li>Bootstrap Based</li>
					<li>Responsive</li>
					<li>Sticky Header</li>
				</ul>
				</div>
			</div>
		</section>

		<section class="section-black">
			<div class="container">
				<h3>Lorem ipsum dolor sit amet</h3>

				<p> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nihil facere quisquam ipsam tenetur, sequi ipsa accusamus, distinctio atque deserunt, dicta hic numquam esse quaerat ex. Expedita inventore voluptatibus rerum dolorem modi magnam repellendus, aspernatur, autem dolor omnis sunt minus quidem laudantium quisquam aliquid dignissimos quae saepe. Perferendis quibusdam officia minus, ipsum fugiat maiores minima. Eaque sint officiis sit, nam maxime blanditiis quas corporis nemo omnis tenetur aliquid iusto possimus, et, ea maiores laboriosam dolores placeat dignissimos atque. Provident ea dolorem amet at. Dicta tempore placeat quam similique, incidunt veniam perspiciatis quis voluptatibus a inventore voluptatum labore, maiores cumque, esse magni.</p>

				<p> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nihil facere quisquam ipsam tenetur, sequi ipsa accusamus, distinctio atque deserunt, dicta hic numquam esse quaerat ex. Expedita inventore voluptatibus rerum dolorem modi magnam repellendus, aspernatur, autem dolor omnis sunt minus quidem laudantium quisquam aliquid dignissimos quae saepe. Perferendis quibusdam officia minus, ipsum fugiat maiores minima. Eaque sint officiis sit, nam maxime blanditiis quas corporis nemo omnis tenetur aliquid iusto possimus, et, ea maiores laboriosam dolores placeat dignissimos atque. Provident ea dolorem amet at. Dicta tempore placeat quam similique, incidunt veniam perspiciatis quis voluptatibus a inventore voluptatum labore, maiores cumque, esse magni.</p>

				<p> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nihil facere quisquam ipsam tenetur, sequi ipsa accusamus, distinctio atque deserunt, dicta hic numquam esse quaerat ex. Expedita inventore voluptatibus rerum dolorem modi magnam repellendus, aspernatur, autem dolor omnis sunt minus quidem laudantium quisquam aliquid dignissimos quae saepe. Perferendis quibusdam officia minus, ipsum fugiat maiores minima. Eaque sint officiis sit, nam maxime blanditiis quas corporis nemo omnis tenetur aliquid iusto possimus, et, ea maiores laboriosam dolores placeat dignissimos atque. Provident ea dolorem amet at. Dicta tempore placeat quam similique, incidunt veniam perspiciatis quis voluptatibus a inventore voluptatum labore, maiores cumque, esse magni.</p>
			</div>
		</section>

		<section class="section-white">
			<div class="container">
				<h3>Lorem ipsum dolor sit amet</h3>

				<p> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nihil facere quisquam ipsam tenetur, sequi ipsa accusamus, distinctio atque deserunt, dicta hic numquam esse quaerat ex. Expedita inventore voluptatibus rerum dolorem modi magnam repellendus, aspernatur, autem dolor omnis sunt minus quidem laudantium quisquam aliquid dignissimos quae saepe. Perferendis quibusdam officia minus, ipsum fugiat maiores minima. Eaque sint officiis sit, nam maxime blanditiis quas corporis nemo omnis tenetur aliquid iusto possimus, et, ea maiores laboriosam dolores placeat dignissimos atque. Provident ea dolorem amet at. Dicta tempore placeat quam similique, incidunt veniam perspiciatis quis voluptatibus a inventore voluptatum labore, maiores cumque, esse magni.</p>

				<p> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nihil facere quisquam ipsam tenetur, sequi ipsa accusamus, distinctio atque deserunt, dicta hic numquam esse quaerat ex. Expedita inventore voluptatibus rerum dolorem modi magnam repellendus, aspernatur, autem dolor omnis sunt minus quidem laudantium quisquam aliquid dignissimos quae saepe. Perferendis quibusdam officia minus, ipsum fugiat maiores minima. Eaque sint officiis sit, nam maxime blanditiis quas corporis nemo omnis tenetur aliquid iusto possimus, et, ea maiores laboriosam dolores placeat dignissimos atque. Provident ea dolorem amet at. Dicta tempore placeat quam similique, incidunt veniam perspiciatis quis voluptatibus a inventore voluptatum labore, maiores cumque, esse magni.</p>

				<p> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nihil facere quisquam ipsam tenetur, sequi ipsa accusamus, distinctio atque deserunt, dicta hic numquam esse quaerat ex. Expedita inventore voluptatibus rerum dolorem modi magnam repellendus, aspernatur, autem dolor omnis sunt minus quidem laudantium quisquam aliquid dignissimos quae saepe. Perferendis quibusdam officia minus, ipsum fugiat maiores minima. Eaque sint officiis sit, nam maxime blanditiis quas corporis nemo omnis tenetur aliquid iusto possimus, et, ea maiores laboriosam dolores placeat dignissimos atque. Provident ea dolorem amet at. Dicta tempore placeat quam similique, incidunt veniam perspiciatis quis voluptatibus a inventore voluptatum labore, maiores cumque, esse magni.</p>
			</div>
		</section>

		<section class="section-black">
			<div class="container">
				<h3>Lorem ipsum dolor sit amet</h3>

				<p> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nihil facere quisquam ipsam tenetur, sequi ipsa accusamus, distinctio atque deserunt, dicta hic numquam esse quaerat ex. Expedita inventore voluptatibus rerum dolorem modi magnam repellendus, aspernatur, autem dolor omnis sunt minus quidem laudantium quisquam aliquid dignissimos quae saepe. Perferendis quibusdam officia minus, ipsum fugiat maiores minima. Eaque sint officiis sit, nam maxime blanditiis quas corporis nemo omnis tenetur aliquid iusto possimus, et, ea maiores laboriosam dolores placeat dignissimos atque. Provident ea dolorem amet at. Dicta tempore placeat quam similique, incidunt veniam perspiciatis quis voluptatibus a inventore voluptatum labore, maiores cumque, esse magni.</p>

				<p> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nihil facere quisquam ipsam tenetur, sequi ipsa accusamus, distinctio atque deserunt, dicta hic numquam esse quaerat ex. Expedita inventore voluptatibus rerum dolorem modi magnam repellendus, aspernatur, autem dolor omnis sunt minus quidem laudantium quisquam aliquid dignissimos quae saepe. Perferendis quibusdam officia minus, ipsum fugiat maiores minima. Eaque sint officiis sit, nam maxime blanditiis quas corporis nemo omnis tenetur aliquid iusto possimus, et, ea maiores laboriosam dolores placeat dignissimos atque. Provident ea dolorem amet at. Dicta tempore placeat quam similique, incidunt veniam perspiciatis quis voluptatibus a inventore voluptatum labore, maiores cumque, esse magni.</p>

				<p> Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nihil facere quisquam ipsam tenetur, sequi ipsa accusamus, distinctio atque deserunt, dicta hic numquam esse quaerat ex. Expedita inventore voluptatibus rerum dolorem modi magnam repellendus, aspernatur, autem dolor omnis sunt minus quidem laudantium quisquam aliquid dignissimos quae saepe. Perferendis quibusdam officia minus, ipsum fugiat maiores minima. Eaque sint officiis sit, nam maxime blanditiis quas corporis nemo omnis tenetur aliquid iusto possimus, et, ea maiores laboriosam dolores placeat dignissimos atque. Provident ea dolorem amet at. Dicta tempore placeat quam similique, incidunt veniam perspiciatis quis voluptatibus a inventore voluptatum labore, maiores cumque, esse magni.</p>
			</div>
		</section>
!

CSS 

              
                
/* # General
================================ */

body {
  font-family: "Open Sans", Helvetica, sans-serif;
}

/* # Header, Main Menu
================================ */

.navbar {
  opacity: 0.8;
  margin-bottom: 0;
  background-color: #fff;
  transition: all 0.2s ease-out;
}

.navbar-container {
	position: relative;
}

.navbar .navbar-nav li a {
  font-size: 14px;
  text-transform: uppercase;
  color: #2E1C05;
  transition: all 0.2s ease-out;
}

.navbar-brand {
  font-size: 25px;
  transition: all 0.2s ease-out;
}

.navbar-scroll {
  opacity: 1;
}

#top-social-menu {
  display: none;
}


@media (min-width: 768px) {
  .navbar {
    height: 120px;
  }

  .navbar-nav>li>a {
    padding: 0;
    margin-top: 35px;
    margin-left: 50px;
    line-height: 70px;
  }

  .navbar-brand {
    font-size: 28px;
    padding: 0;
    height: 120px;
    line-height: 120px;
  }

  #top-social-menu {
    display: initial;
  }

  /* Navbar when scrolled */

  .navbar-scroll {
    height: 70px;
  }

  .navbar-scroll #top-social-menu {
    display: none;
    transition: all 0.2s ease-out;
  }

  .navbar-scroll .navbar-brand {
    height: 70px;
    line-height: 70px;
  }

  .navbar-scroll .navbar-nav>li>a {
    opacity: 1;
    padding: 0;
    margin-top: 0;
  }
}

/* # Hover Link Effect
================================ */
@media (min-width: 768px) {
  .navbar-nav>li>a::after {
    position: absolute;
    top: 80%;
    left: 0;
    width: 100%;
    height: 1px;
    background: #2E1C05;
    content: '';
    opacity: 0;
    transition: height 0.3s, opacity 0.3s, transform 0.3s;
    transform: translateY(-10px);
  }

  .navbar-nav>li>a:hover::after,
  .navbar-nav>li>a:focus::after {
    height: 2px;
    opacity: 1;
    transform: translateY(0px);
  }
}

/* # Social menu
================================ */

#top-social-menu {
  position: absolute;
  top: 7px;
  right: 0;
  font-size: 12px;
  z-index: 101;
  padding-right: 0px;
  list-style: none;
  color: #2E1C05;
  transition: all 0.2s ease-out;
}

#top-social-menu li {
  float: left;
  padding: 10px 15px;
}

#top-social-menu li:last-child {
  padding-right: 0;
}

#top-social-menu li a {
  text-decoration: none;
  color: #2E1C05;
}

#top-social-menu li a:hover {
  text-decoration: none;
  color: #543A1A;
}

#top-social-menu i {
 	font-size: 16px;
  
  transition: all 0.2s ease-in;
}

#top-social-menu i:hover {
  text-decoration: none;
  color: #543A1A;
}

/* # Section Full Width Image
================================ */

.full-width-img {
  background: url('http://res.cloudinary.com/do5ht5y0y/image/upload/v1501322753/bg-cp-header_zps4ghnoxc7_zx2ayd.jpg') no-repeat center center;
  background-size: cover;
  text-align: center;
  padding-top: 100px;
  height: 450px;
  color: #fff;
}

.box {
	background: rgba(0, 0, 0, 0.4);
  border: 3px solid #000;
  color: #fff;
  text-align: center;
  margin-top: 10px;
  padding: 10px 20px;
}

.subheading-text {
  list-style: none;
  font-size: 35px;
  line-height: 50px;
}

@media (min-width: 768px) {

  .full-width-img {
    padding-top: 110px;
    height: 1000px;
  }

  .subheading-text {
    font-size: 50px;
    line-height: 70px;
  }

  .box {
    margin-top: 100px;
    padding: 80px 20px;
  }
}
/* # Section Black, White
================================ */

.section-black,
.section-white {
	padding: 50px 0;
	color: #fff;
	line-height: 1.7;
}

.section-black h3,
.section-white h3 {
	margin-bottom: 60px;
}

.section-black p,
.section-white p {
  margin-bottom: 60px;
}

.section-black {
	background: linear-gradient(#363437, #121112);
}

.section-white {
	background: linear-gradient(#ffffff, #f3f3f3);
  color: #0e0d0e;
}
!

JS 

              
                $(window).scroll(function () {
	var sc = $(window).scrollTop()
	if (sc > 150) {
		$("#main-navbar").addClass("navbar-scroll")
	} 
	else {
		$("#main-navbar").removeClass("navbar-scroll")
	}
});
!
999px

Console