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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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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.

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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

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JavaScript

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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>

<!-- 

Hello Camper!

For now, the test suite only works in Chrome! Please read the README below in the JS Editor before beginning. Feel free to delete this message once you have read it. Good luck and Happy Coding! 

- The freeCodeCamp Team 

-->

<link href="https://fonts.googleapis.com/css2?family=Roboto:wght@100;400;700&display=swap" rel="stylesheet">

<html>
  <body>
   <div class="container">
    <nav id="navbar" class="navbar">
      <header>
        <p class="tc-header">CSS Functions</p>
        <a href="#hsl()_Function" class="nav-link">hsl() Function</a>
        <a href="#hsla()_Function" class="nav-link">hsla() Function</a>
        <a href="#rgb()_Function" class="nav-link">rgb() Function</a>
        <a href="#rgba()_Function" class="nav-link">rgba() Function</a>
        <a href="#var()_Function" class="nav-link">var() Function</a>
      </header>
    </nav>
    
    <main id="main-doc">
      
      <section class="main-section" id="hsl()_Function">
        <header>hsl() Function</header>
        <p class="description">Definition and Usage</p>
        <p>The hsl() function define colors using the Hue-saturation-lightness model (HSL).</p>
        <p>HSL stands for hue, saturation, and lightness - and represents a cylindrical-coordinate representation of colors.</p>
        <code>#p1 {background-color:hsl(120,100%,50%);} /* green */</code>
        
        <!-- Start Table 1 -->
        <p class="description">CSS Syntax</p>
          <div class="tbl-flx">      
          <ul>
          <div class="tbl-flx-left">    
            <li>hsl(hue, saturation, lightness)</li>
            <li><span class="tc-span-1">Value</span></li>
            <li><span class="tc-span-1">hue</span></li>
            <li><span class="tc-span-1">saturation</span></li>
            <li><span class="tc-span-1">lightness</span></li>
         </div> <!-- Close   tbl-flx-left -->         
        </ul>
       
          
        <ul>
        <div class="tbl-flx-right">    
            <li class="tbl-bs">.</li>       
            <li><span class="tc-span-1"></span>	Description</li>
            <li><span class="tc-span-1"></span>Defines a degree on the color wheel (from 0 to 360) - 0 (or 360) is red, 120 is green, 240 is blue</li>
            <li><span class="tc-span-1"></span>	Defines the saturation; 0% is a shade of gray and 100% is the full color (full saturation)</li>
            <li><span class="tc-span-1"></span>	Defines the lightness; 0% is black, 50% is normal, and 100% is white</li>
        </div> <!-- Close   tbl-flx-right -->      
        </ul>
        
        </div> <!-- Close class="tbl-flx" -->  
      </section>
       
      <section class="main-section" id="hsla()_Function">
        <header>hsla() Function</header>
        <p class="description">Definition and Usage</p>
        <p>The hsla() function define colors using the Hue-saturation-lightness-alpha model (HSLA).</p>
        <p>HSLA color values are an extension of HSL color values with an alpha channel - which specifies the opacity of the color.</p>
        <code>#p4 {background-color:hsla(120,60%,70%,0.3);} /* pastel green */</code>
        
        <!-- Start Table 2 -->
        <p class="description">CSS Syntax</p>
          <div class="tbl-flx">      
          <ul>
          <div class="tbl-flx-left">    
            <li>hsla(hue, saturation, lightness, alpha)</li>
            <li><span class="tc-span-1">Value</span></li>
            <li><span class="tc-span-1">hue</span></li>
            <li><span class="tc-span-1">saturation</span></li>
            <li><span class="tc-span-1">lightness</span></li>
            <li><span class="tc-span-1">alpha</span></li>
         </div> <!-- Close   tbl-flx-left -->         
        </ul>
       
          
        <ul>
        <div class="tbl-flx-right">    
            <li class="tbl-bs">.</li>       
            <li><span class="tc-span-1"></span>Description</li>
            <li><span class="tc-span-1"></span>Defines a degree on the color wheel (from 0 to 360) - 0 (or 360) is red, 120 is green, 240 is blue</li>
            <li><span class="tc-span-1"></span>Defines the saturation; 0% is a shade of gray and 100% is the full color (full saturation)</li>
            <li><span class="tc-span-1"></span>Defines the lightness; 0% is black, 50% is normal, and 100% is white</li>
            <li><span class="tc-span-1"></span>Defines the opacity as a number between 0.0 (fully transparent) and 1.0 (fully opaque)</li>
        </div> <!-- Close   tbl-flx-right -->      
        </ul>
        
        </div> <!-- Close class="tbl-flx" Table 2 -->                 
      </section>
      
      <section class="main-section" id="rgb()_Function">
        <header>rgb() Function</header>
        <p class="description">Definition and Usage</p>
        <p>The rgb() function define colors using the Red-green-blue (RGB) model.</p>
        <p>An RGB color value is specified with: rgb(red, green, blue). Each parameter defines the intensity of that color and can be an integer between 0 and 255 or a percentage value (from 0% to 100%).</p>
        <p>For example, the rgb(0,0,255) value is rendered as blue, because the blue parameter is set to its highest value (255) and the others are set to 0.</p>    
        <code>#p2 {background-color:rgb(0,255,0);} /* green */</code>
        
        <!-- Start Table 3 -->
        <p class="description">CSS Syntax</p>
          <div class="tbl-flx">      
          <ul>
          <div class="tbl-flx-left">    
            <li>rgb(red, green, blue)</li>
            <li><span class="tc-span-1">Value</span></li>
            <li><span class="tc-span-1">red</span></li>
            <li><span class="tc-span-1">green</span></li>
            <li><span class="tc-span-1">blue</span></li>
         </div> <!-- Close   tbl-flx-left -->         
        </ul>
       
          
        <ul>
        <div class="tbl-flx-right">    
            <li class="tbl-bs">.</li>       
            <li><span class="tc-span-1"></span>Description</li>
            <li><span class="tc-span-1"></span>Defines the intensity of red as an integer between 0 and 255, or as a percentage value between 0% and 100%</li>
            <li><span class="tc-span-1"></span>	Defines the intensity of green as an integer between 0 and 255, or as a percentage value between 0% and 100%</li>
            <li><span class="tc-span-1"></span>	Defines the intensity of blue as an integer between 0 and 255, or as a percentage value between 0% and 100%</li>
        </div> <!-- Close   tbl-flx-right -->      
        </ul>
        
        </div> <!-- Close class="tbl-flx" Table 3 -->                
      </section>
      
      <section class="main-section" id="rgba()_Function">
        <header>rgba() Function</header>
        <p class="description">Definition and Usage</p>
        <p>The rgba() function define colors using the Red-green-blue-alpha (RGBA) model.</p>
        <p>RGBA color values are an extension of RGB color values with an alpha channel - which specifies the opacity of the color.</p>
        <code>#p2 {background-color:rgba(0,255,0,0.3);} /* green with opacity */</code>
        
        <!-- Start Table 4 -->
        <p class="description">CSS Syntax</p>
          <div class="tbl-flx">      
          <ul>
          <div class="tbl-flx-left">    
            <li>rgba(red, green, blue, alpha)</li>
            <li><span class="tc-span-1">Value</span></li>
            <li><span class="tc-span-1">red</span></li>
            <li><span class="tc-span-1">green</span></li>
            <li><span class="tc-span-1">blue</span></li>
            <li><span class="tc-span-1">alpha</span></li>
         </div> <!-- Close   tbl-flx-left -->         
        </ul>
       
          
        <ul>
        <div class="tbl-flx-right">    
            <li class="tbl-bs">.</li>       
            <li><span class="tc-span-1"></span>Description</li>
            <li><span class="tc-span-1"></span>Defines the intensity of red as an integer between 0 and 255, or as a percentage value between 0% and 100%</li>
            <li><span class="tc-span-1"></span>Defines the intensity of green as an integer between 0 and 255, or as a percentage value between 0% and 100%</li>
            <li><span class="tc-span-1"></span>Defines the intensity of blue as an integer between 0 and 255, or as a percentage value between 0% and 100%</li>
            <li><span class="tc-span-1"></span>Defines the opacity as a number between 0.0 (fully transparent) and 1.0 (fully opaque)</li>
        </div> <!-- Close   tbl-flx-right -->      
        </ul>
        
        </div> <!-- Close class="tbl-flx" Table 4 -->                
      </section>
      
      <section class="main-section" id="var()_Function">
        <header>var() Function</header>
        <p class="description">Definition and Usage</p>
        <p>The var() function is used to insert the value of a custom property instead of any part of a value of another property.</p>
        <code>:root {--main-bg-color: coral;}
          <br>
          #div1 {
            background-color: var(--main-bg-color);
          }
          <br>
          #div2 {
            background-color: var(--main-bg-color);
          }</code>
        
        
                <!-- Start Table 5 -->
        <p class="description">CSS Syntax</p>
          <div class="tbl-flx">      
          <ul>
          <div class="tbl-flx-left">    
            <li>var(custom-property-name, value)</li>
            <li><span class="tc-span-1">Value</span></li>
            <li><span class="tc-span-1">custom-property-name</span></li>
            <li><span class="tc-span-1">value</span></li>
         </div> <!-- Close   tbl-flx-left -->         
        </ul>
       
          
        <ul>
        <div class="tbl-flx-right">    
            <li class="tbl-bs">.</li>       
            <li><span class="tc-span-1"></span>Description</li>
            <li><span class="tc-span-1"></span>Required. The custom property's name (must start with two dashes)</li>
            <li><span class="tc-span-1"></span>Optional. The fallback value (used if the custom property is invalid)</li>
        </div> <!-- Close   tbl-flx-right -->      
        </ul>
        
        </div> <!-- Close class="tbl-flx" Table 5 -->            
        
        
<!--        <div class="td-alt-color">
         <ul>
            <li>li-1</li>
            <li>li-2</li>
            <li>li-3</li>
            <li>li-4</li>
            <li>li-5</li>
          </ul>
        </div>   -->
        
      </section>
            
    </main>
     <footer id="footer">
     <p>For full documentation visit <a href="https://www.w3schools.com/cssref/css_functions.asp" target="_blank"> w3schools.com</a> <img src="https://www.w3schools.com/favicon.ico" height="25px" id="logo"> </p>
     </footer>
     
   </div> 
  </body>
</html>
!

CSS 

              
                html {
  scroll-behavior: smooth; 
}

body {
  background-color: whitesmoke;
  font-family: 'Roboto', sans-serif;
  margin: 0;
  padding: 0;

}

div.container {
/*   border: 1px solid orange;  */
  display: grid;
  grid-template-columns: minmax(250px, auto) minmax(550px, 1fr);
  grid-template-areas: 
    "nav-grid main-grid"
    "footer footer";
  grid-gap: 50px;  
}

.tc-header {
  border: 1px solid white;
  background-color: whitesmoke;
  border-radius: 5px;
  box-shadow: 3px 3px 3px gray;
}

nav#navbar {
  grid-area: nav-grid;
  position: fixed;
}

nav#navbar a {
/*   border: 1px solid black;  */
  display: flex;
  padding: 5px;
  margin: 10px 0;
  text-decoration: none;
  color: whitesmoke;
  text-shadow: 1px 1px 1px black;
}

.navbar {
  border: 1px solid white; 
  border-radius: 5px;
  box-shadow: 3px 3px 3px gray;
  background-color: #999;
  padding: 5px;
  text-align: center;
}


main#main-doc {
/*   border: 1px solid; */
  grid-area: main-grid;
}

#footer {
  display: flex;
  grid-area: footer;
  justify-content: center;
  text-shadow: 1px 1px 1px white; 
}

#footer img {
  box-shadow: 3px 3px 3px gray;
  margin-bottom: -5px;
}

header {
/*   color: red; */
  font-size: 1.7rem; 
  font-weight: bold;
  margin: 15px auto;
  text-shadow: 1px 1px 1px #333;
}

code {
  color: white;
  text-shadow: 1px 1px 1px black;
  background-color: #999;
  display: block;
  padding: 20px;
  border: 1px solid white;
  border-radius: 5px;
  box-shadow: 3px 3px 3px gray;
}

.description {
  font-size: 1.5em;
}

ul {
  list-style: none;
  padding-left: 0;
}

ul li.tbl-bs {
  color: black;
}

.tbl-flx {
/*   border: 2px solid yellow; */
  display: flex;
  padding: 0;
  margin: 0;
}

.tbl-flx-left {
  display: flex;
  flex-direction: column;
  white-space: nowrap;
  border-top: 2px solid black;
  border-left: 2px solid black;
  border-bottom: 2px solid black;
}

.tbl-flx-right {
  display: flex;
  flex-direction: column;
/*   overflow: scroll;  */
  white-space: nowrap;
  border-top: 2px solid black;
  border-right: 2px solid black;
  border-bottom: 2px solid black;
}

.tc-span-1:nth-child(2) {
/*   color: green; */
  font-weight: bold;
  font-style: normal;
  padding-right: 40px;
}

.tbl-flx-left li:nth-child(2) {
/*   color: green; */
  font-style: initial !important;
}

.tc-span-1:first-child {
/*   color: red; */
/*   border: 1px solid blue; */
}

ul li {
  text-shadow: 1px 1px 1px #333;
  list-style-type: none;
  text-shadow: none;
  padding: 3px;
}


li:nth-child(odd) {
  background-color: #999;
}

li:nth-child(even) {
  background-color: white;
}

li:first-child {
  color: whitesmoke;
  background-color: black;
  font-style: italic;
}

li:nth-child(2) {
  font-weight: bold;
}

footer {
  background-color: #999;
  display: block;
  padding: 20px;
  border: 1px solid white;
  border-radius: 5px;
/*   box-shadow: -3px -3px 0px gray; */
}

@media screen and (max-width: 500px) {
  div.container {
    grid-template-columns: 1fr;
    grid-template-areas:
      "nav-grid" 
      "main-grid"
      "footer";
    grid-gap: 25px;  
    padding: 25px;
  }
    
nav#navbar {
  /*   border: 1px solid blue; */
  position: inherit;
  /*   display: flex; */
  text-align: left;
  }
  
  #footer {
    justify-content: left;
  }
}
!

JS 

              
                // !! IMPORTANT README:

// You may add additional external JS and CSS as needed to complete the project, however the current external resource MUST remain in place for the tests to work. BABEL must also be left in place. 

/***********
INSTRUCTIONS:
  - Select the project you would 
    like to complete from the dropdown 
    menu.
  - Click the "RUN TESTS" button to
    run the tests against the blank 
    pen.
  - Click the "TESTS" button to see 
    the individual test cases. 
    (should all be failing at first)
  - Start coding! As you fulfill each
    test case, you will see them go   
    from red to green.
  - As you start to build out your 
    project, when tests are failing, 
    you should get helpful errors 
    along the way!
    ************/

// PLEASE NOTE: Adding global style rules using the * selector, or by adding rules to body {..} or html {..}, or to all elements within body or html, i.e. h1 {..}, has the potential to pollute the test suite's CSS. Try adding: * { color: red }, for a quick example!

// Once you have read the above messages, you can delete all comments.
!
999px

Console