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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>

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

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 

              
                <script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script>

  
    <nav class="navbar" id="navbar">
    <ul class="navbar-nav">
      <li class="logo">
        
          <header class="link-text logo-text" >Html</header>
           <svg
            aria-hidden="true"
            focusable="false"
            data-prefix="fad"
            data-icon="angle-double-right"
            role="img"
            xmlns="http://www.w3.org/2000/svg"
            viewBox="0 0 448 512"
            class="svg-inline--fa fa-angle-double-right fa-w-14 fa-5x"
          >
            <g class="fa-group">
              <path
                fill="currentColor"
                d="M224 273L88.37 409a23.78 23.78 0 0 1-33.8 0L32 386.36a23.94 23.94 0 0 1 0-33.89l96.13-96.37L32 159.73a23.94 23.94 0 0 1 0-33.89l22.44-22.79a23.78 23.78 0 0 1 33.8 0L223.88 239a23.94 23.94 0 0 1 .1 34z"
                class="fa-secondary"
              ></path>
              <path
                fill="currentColor"
                d="M415.89 273L280.34 409a23.77 23.77 0 0 1-33.79 0L224 386.26a23.94 23.94 0 0 1 0-33.89L320.11 256l-96-96.47a23.94 23.94 0 0 1 0-33.89l22.52-22.59a23.77 23.77 0 0 1 33.79 0L416 239a24 24 0 0 1-.11 34z"
                class="fa-primary"
              ></path>
            </g>
          </svg>
          
        
        </a>
      </li>
<section id="Elements" class="nav-item">
      
        <a href="#Elements" class="nav-link" >
          
          <span class="link-text">Elements</span>
          
        </a>
      </li>
</section>
      <li class="nav-item">
        <a href="#attributes" class="nav-link">
          
          <span class="link-text">Attributes</span>
        </a>
      </li>

      <li class="nav-item">
        <a href="#headings" class="nav-link">
          
          <span class="link-text">Headings</span>
        </a>
      </li>

      <li class="nav-item">
        <a href="#paragraphs" class="nav-link">
          
          <span class="link-text">Paragraphs</span>
        </a>
      </li>
      <li class="nav-item">
        <a href="#styles" class="nav-link">
         
          <span class="link-text">Styles</span>
        </a>
      </li>

      
    </ul>
  </nav>

    

<main id="main-doc">
   <section class="main-section" id="Elements">
     <header><b>Elements</b></header>
     <p>An HTML element usually consists of a start tag and an end tag, with the content inserted in between:</p>
     <code>&lt;tagname&gt;Content goes here...&lt;/tagname&gt;</code>
  <p>The HTML element is everything from the start tag to the end tag:</p>
     <p>Here are some common elements
     <li>&lt;h1&gt;My first heading&lt;/h1&gt;</li>
       <li>&lt;p&gt;My first paragraph &lt;/p&gt;</li>
       <li>&lt;br&gt;</li>
       <p>HTML elements with no content are called empty elements. Empty elements do not have an end tag, such as the &lt;br&gt; element (which indicates a line break).</p>
  </section>
  
  
   <section class="main-section" id="attributes">
    <header>Attributes</header>
     <p>Attributes provide additional information about HTML elements</p>
     <li>All HTML elements can have attributes</li>
     <li>Attributes provide additional information about an element</li>
     <li>Attributes are always specified in the start tag</li>
     <li>Attributes usually come in name/value pairs like: name="value"
</li>
  <p></p>
     <code></code>
  </section>
  
  
  
   <section class="main-section" id="headings">
    <header>Headings</header>
     <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras eget pulvinar erat. Fusce vitae gravida diam. Praesent dapibus ligula aliquet elementum laoreet. Morbi ut nisl ullamcorper erat egestas cursus. Aenean rutrum, magna eu congue facilisis, leo orci consectetur tortor, eu condimentum ex diam dictum nisi. Praesent quis odio et diam interdum auctor. Quisque pulvinar sit amet sem ac dictum. Vestibulum sit amet luctus odio.</p>
  <p></p>
     <code></code>
  </section>
  
  
  
   <section class="main-section" id="paragraphs">
    <header>Paragraphs</header>
     <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras eget pulvinar erat. Fusce vitae gravida diam. Praesent dapibus ligula aliquet elementum laoreet. Morbi ut nisl ullamcorper erat egestas cursus. Aenean rutrum, magna eu congue facilisis, leo orci consectetur tortor, eu condimentum ex diam dictum nisi. Praesent quis odio et diam interdum auctor. Quisque pulvinar sit amet sem ac dictum. Vestibulum sit amet luctus odio.
     In hac habitasse platea dictumst. Suspendisse eros leo, porttitor sed fermentum nec, sagittis eget velit. Suspendisse sed nunc dolor. Vestibulum ut sagittis libero, sed luctus orci. Quisque pretium mattis ex et blandit. Donec mollis arcu leo, quis convallis sapien ultrices eget. Donec condimentum ornare leo eu luctus. Suspendisse varius feugiat porta.

Nullam massa elit, gravida vel sapien ut, dictum condimentum ipsum. Aliquam dapibus ultricies bibendum. Suspendisse vulputate justo quis ex facilisis, vel cursus est imperdiet. Praesent eu accumsan diam. Nulla et efficitur sem. Mauris ac placerat sem. Sed semper mi nec nibh fermentum tempor. Integer quis sapien ut sapien tristique vehicula ut sed nisl. Mauris metus neque, feugiat et diam vitae, dignissim fringilla est.</p>
  <p></p>
     <code></code>
     </section>
  
  
     <section class="main-section" id="styles">
    <header>Styles</header>
       <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras eget pulvinar erat. Fusce vitae gravida diam. Praesent dapibus ligula aliquet elementum laoreet. Morbi ut nisl ullamcorper erat egestas cursus. Aenean rutrum, magna eu congue facilisis, leo orci consectetur tortor, eu condimentum ex diam dictum nisi. Praesent quis odio et diam interdum auctor. Quisque pulvinar sit amet sem ac dictum. Vestibulum sit amet luctus odio.
       In hac habitasse platea dictumst. Suspendisse eros leo, porttitor sed fermentum nec, sagittis eget velit. Suspendisse sed nunc dolor. Vestibulum ut sagittis libero, sed luctus orci. Quisque pretium mattis ex et blandit. Donec mollis arcu leo, quis convallis sapien ultrices eget. Donec condimentum ornare leo eu luctus. Suspendisse varius feugiat porta.

Nullam massa elit, gravida vel sapien ut, dictum condimentum ipsum. Aliquam dapibus ultricies bibendum. Suspendisse vulputate justo quis ex facilisis, vel cursus est imperdiet. Praesent eu accumsan diam. Nulla et efficitur sem. Mauris ac placerat sem. Sed semper mi nec nibh fermentum tempor. Integer quis sapien ut sapien tristique vehicula ut sed nisl. Mauris metus neque, feugiat et diam vitae, dignissim fringilla est.</p>
  <p></p>                                                 
       <code></code>
  </section>
  
  
  
</main>
!

CSS 

              
                body{
  font-size:24px;
  color:black;
  backgroud-color: grey;
  margin:0;
  padding:0;
 
}
main{
  margin-left:3rem;
  padding:3rem;
  
}
.navbar{
  width:5rem;
  height:100vh;
  position:fixed;
}

.navbar {
  position: fixed;
  background-color: grey;
  transition: width 600ms ease;
  overflow: scroll;
}

.navbar-nav {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
}

.nav-item {
  width: 100%;
}

.nav-item:last-child {
  margin-top: auto;
}

.nav-link {
  display: flex;
  align-items: center;
  height: 5rem;
  color: var(--text-primary);
  text-decoration: none;
  filter: grayscale(100%) opacity(0.7);
  transition: var(--transition-speed);
}

.nav-link:hover {
  filter: grayscale(0%) opacity(1);
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

#link-text {
  display: none;
  margin-left: 1rem;
}

.nav-link svg {
  width: 2rem;
  min-width: 2rem;
  margin: 0 1.5rem;
}

.fa-primary {
  color: #ff7eee;
}

.fa-secondary {
  color: #df49a6;
}

.fa-primary,
.fa-secondary {
  transition: var(--transition-speed);
}

.logo {
  font-weight: bold;
  text-transform: uppercase;
  margin-bottom: 1rem;
  text-align: center;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  font-size: 1.5rem;
  letter-spacing: 0.3ch;
  width: 100%;
}

.logo svg {
  transform: rotate(0deg);
  transition: var(--transition-speed);
  transition-duration:1s;
}

.logo-text
{
  display: inline;
  position: absolute;
  left: -999px;
  transition: var(--transition-speed);
}

.navbar:hover .logo svg{
  transform: rotate(-180deg);
}

/* Small screens */
@media only screen and (max-width: 600px) {
  .navbar {
    bottom: 0;
    width: 100vw;
    height: 10rem;
    
  }

  .logo {
    display: none;
  }

  .navbar-nav {
    flex-direction: row;
  }

  .nav-link {
    justify-content: center;
  }

  main {
    margin: 0;
  }
}

/* Large screens */
@media only screen and (min-width: 600px) {
  .navbar {
    top: 0;
    width: 5rem;
    height: 100vh;
  }

  .navbar:hover {
    width: 16rem;
  }

  .navbar:hover .link-text {
    display: inline;
  }

  .navbar:hover .logo svg
  {
    margin-left: 11rem;
  }

  .navbar:hover .logo-text
  {
    left: 45px;
    top:15px;
    font-size:35px;
  }



  body::-webkit-scrollbar {
  width: 0.75rem;
}

body::-webkit-scrollbar-track {
  background: #1e1e24;
}

body::-webkit-scrollbar-thumb {
  background: #6649b8;
}
!

JS
!
999px

Console