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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

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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.

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <body data-spy="scroll" data-target="#myScrollspy">
  <header id ="header">
    <nav class="navbar navbar-fixed-top" id="myScrollspy">
      <img src='https://imgur.com/HLgsfR7.jpg' alt='CrisBarreiro' title='CrisBarreiro'/>
      <ul class="nav nav-tabs" role="tablist" id ="nav-list">
        <li><a href="#about">About</a></li>
        <li><a href="#projects">Projects</a></li>
        <li><a href="#contact">Contact</a></li>
      </ul>
    </nav>
  </header>
  <main id="content">
    <div id="about">
      <div id="about-div">
        <h1 class="text-center">About</h1>
          <hr class="dark"/>
        <div id="intro">
          <p id="about-text">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean nulla sapien, semper luctus nunc ac, dapibus pulvinar odio. Morbi feugiat nibh sit amet ante rhoncus, sed tempus dolor pharetra. Nam egestas placerat malesuada. Nulla quam risus, varius vel ipsum at, porta aliquam ligula. Nullam eleifend felis ut arcu maximus euismod eget non erat. Mauris faucibus ultricies diam ut dapibus.<p>
        <hr class="bright">
          <p class="skills">Software Developer</p>
        </div>
        <img id="avatar" src="https://imgur.com/HLgsfR7.jpg"/>
      </div>
    </div>
    
    <section id="projects">
      <h1 class="text-center">Projects</h1>
          <hr class="dark">
      <img class="col-2-image-l" src="http://qlip.in/sites/default/files/YMCA-Realtor-Donation-3.jpg">
      <img class="col-2-image-r" src="http://qlip.in/sites/default/files/YMCA-Realtor-Donation-3.jpg">
      <img class="col-2-image-l" src="http://qlip.in/sites/default/files/YMCA-Realtor-Donation-3.jpg">
       <img class="col-2-image-r" src="http://qlip.in/sites/default/files/YMCA-Realtor-Donation-3.jpg">
       <img class="col-2-image-l" src="http://qlip.in/sites/default/files/YMCA-Realtor-Donation-3.jpg">
       <img class="col-2-image-r" src="http://qlip.in/sites/default/files/YMCA-Realtor-Donation-3.jpg">
    </section>
    <section id="contact">
      <h1 class="text-center">Contact</h1>
      <hr class="dark">
      <form id="contact-form" action="#about">
        <div class="form-item">
          <input class="input" type="text" id="name" required/>
          <span class="highlight"></span>
          <span class="bar"></span>
          <label id="name-label" for="name">Name</label>
        </div>
        
        <div class="form-item">
          <input class="input" type="text" id="email" required/>
          <span class="highlight"></span>
          <span class="bar"></span>
          <label id="email-label" for="email">Email</label>
        </div>
        
        <div class="form-item">
          <input class="input" type="text" id="phone" required>
          <span class="highlight"></span>
          <span class="bar"></span>
          <label id="phone-label" for="phone">Phone number</label>
        </div>
        
        <div class="form-item">
          <textarea class="input" id ="message" rows="4" cols="50" required></textarea>
           <span class="highlight"></span>
           <span class="bar"></span>
           <label id="message-label" for="message">Message</label>
        </div>
        <div>
          <button class="btn btn-primary" type="submit">Send</button>
        </div>
      </form>
    </section>
  </main>
  <footer>
    <div class="row">
      <div id="about-page" class="col-md-6">
        <h3 class="text-center">About this page</h3>
        <p class="text-center">Made with <i class="fa fa-music"></i> and <i class="fa fa-heart"></i> by <a target="_blank" href="https://github.com/CrisBarreiro">Cristina Sánchez</a></p>
      </div>
      <div id="find-me" class="col-md-6">
        <h3 class="text-center">Find me at</h3>
        <ul class="text-center">
          <a target="_blank" href="https://linkedin.com/in/CrisBarreiro"><i class="fa fa-fw fa-linkedin"></i></a>
          <a target="_blank" href="https://twitter/CrisBarreiro"><i class="fa fa-fw fa-twitter"></i></a>
           <a target="_blank" href="https://github.com/CrisBarreiro"><i class="fa fa-fw fa-github"></i></a>
        <ul>
      </div>
    </div>
  </footer>
</body>
!

CSS 

              
                $fargglad:#722872;
$morkfarg:#592059;
$morkgra:#888;

body{
  margin:0;
  padding-top: 80px;
  color:#666;
  background:#888;
  font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;
  font-size: 20px;
  position: relative;
}

header{
  text-align: right;
  height: 80px;
  padding: 0 80px;
  width: 100%;
  top: 0px;
}

nav{
  font-size: 13px;
  background:black;
  padding: 0 200px;
}

nav>ul>li{
  height:100%;
  text-transform:uppercase;
  font-weight:bold;
  letter-spacing:2px;
  display:inline-flex;
  padding: 20px 0;
}

nav>ul>li>a{
  color:#f5f5f5;
  padding:10px 20px;
  text-decoration: none;
}

nav>ul>li>a:hover {
  background:#bbb;
  box-shadow: 0px 2px 2px 1px rgba(0, 0, 0, 0.1);
  text-decoration: none;
}

nav>ul>li>a:active {
  background:#bbb;
   box-shadow: 0px 2px 2px 1px rgba(0, 0, 0, 0.1);
  text-decoration: none;
}

nav>img {
  height:50px;
  margin:15px 0;
  float: left;
  border-radius: 50%;
}

section {
  margin: 0 200px;
  padding: 30px 30px 30px 30px;
  position: relative;
}

#avatar {
  border-radius: 50%;
  width: 250px;
  float: right;
}

#about-text {
  display: inline-block;
  font-size: 20px;
}

#intro {
  float: left;
  width: 70%;
}

#about {
  display: inline-block;
  background: #ebebe0;
}
.skills {
  font-size: 1.5em;
}

h1 {
  text-transform:uppercase;
  clear: both;
}

hr.bright, hr.dark{
    margin: 40px auto 30px;
    padding: 0;
    max-width: 512px;
    border: 0;
    border-top: solid 5px;
    text-align:center;
}
  
hr.bright {
  border-color: #fff;
}
  
hr.dark {
    border-color: black;
 }

hr {
  clear: both;
}

#projects {
  background: pink;
  display: inline-block;
}

section>img{
  width: 50%;
  padding: 25px;
}

.col-2-image-l {
  float: left;
}

.col-2-image-r {
  float: right;
}

/*label {
  display: block;
  opacity: 0;
}

.form-item-filled {
  opacity: 1;
}*/

.form-item {
  position:relative; 
  margin-bottom: 35px; 
}

.input {
  font-size:18px;
  padding:10px 10px 10px 5px;
  display:block;
  width:300px;
  border:none;
  border-bottom:1px solid #757575;
  background: transparent;
}

.input:focus {
  outline: none;
}

label 				 {
  color:#999; 
  font-size:1.5em;
  font-weight:normal;
  position:absolute;
  pointer-events:none;
  left:5px;
  top:10px;
  transition:0.2s ease all; 
  -moz-transition:0.2s ease all; 
  -webkit-transition:0.2s ease all;
}

.input:focus ~ label, .input:valid ~ label 		{
  top:-20px;
  font-size:14px;
  color: black;
  font-weight: bold;
}

.inputMaterial:focus {
  -webkit-animation:inputHighlighter 0.3s ease;
  -moz-animation:inputHighlighter 0.3s ease;
  animation:inputHighlighter 0.3s ease;
}

.inputMaterial:focus ~ .highlight {
  -webkit-animation:inputHighlighter 0.3s ease;
  -moz-animation:inputHighlighter 0.3s ease;
  animation:inputHighlighter 0.3s ease;
}

/* ANIMATIONS ================ */
@-webkit-keyframes inputHighlighter {
	from { background:#5264AE; }
  to 	{ width:0; background:transparent; }
}
@-moz-keyframes inputHighlighter {
	from { background:#5264AE; }
  to 	{ width:0; background:transparent; }
}
@keyframes inputHighlighter {
	from { background:#5264AE; }
  to 	{ width:0; background:transparent; }
}

button {
  font-size: 1.5em;
}

#contact {
  background: #ebebe0;
}

article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
  display: block;
}

footer {
  height: 120px;
  background: black;
  color: white;
  margin-bottom: 0;
}

#about-page {
  float-left;
}

#find-me {
  float-right;
}

.fa-linkedin, .fa-twitter, .fa-github{
  font-size: 3em;
}
!

JS 

              
                $(document).ready(function(){
    $('a[href^="#"]').click(function(e) {
        e.preventDefault();
        var target = this.hash, $target = $(target);
        $('html, body').stop().animate({
            'scrollTop': $target.offset().top-80
        }, 300, 'swing', function() {
            window.location.hash = target;
        });
    });
});
!
999px

Console