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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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CSS

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CSS Base

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HTML 

              
                
<header class='header text-center'>
    <h2>Rating Widget</h2>
  <p>A simple star rating widget with <b>jQuery</b> and <b>FontAwesome</b> icons.</p>
</header>

<section class='rating-widget'>
  
  <!-- Rating Stars Box -->
  <div class='rating-stars text-center'>
    <ul id='stars'>
      <li class='star' title='Poor' data-value='1'>
        <i class='fa fa-star fa-fw'></i>
      </li>
      <li class='star' title='Fair' data-value='2'>
        <i class='fa fa-star fa-fw'></i>
      </li>
      <li class='star' title='Good' data-value='3'>
        <i class='fa fa-star fa-fw'></i>
      </li>
      <li class='star' title='Excellent' data-value='4'>
        <i class='fa fa-star fa-fw'></i>
      </li>
      <li class='star' title='WOW!!!' data-value='5'>
        <i class='fa fa-star fa-fw'></i>
      </li>
    </ul>
  </div>
  
  <div class='success-box'>
    <div class='clearfix'></div>
    <img alt='tick image' width='32' src='data:image/svg+xml;utf8;base64,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'/>
    <div class='text-message'></div>
    <div class='clearfix'></div>
  </div>
  
  
  
</section>



<footer id="a-footer">
  
  
  <div class="affiliate-container" style="justify-content: center;">
  <a href="https://wordpress.com/alp/?aff=17623&cid=1874995" target="_blank" class="wp-overlay-link"></a>
  <div class="wp-icon-circle">
    <span>WP</span>
  </div>
  <div class="the-text">
    <span>Need a site? Get one with WordPress.com!</span>
  </div>
</div>
  
  
  <div class="new-react-version">
    <div class="react-svg-logo"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
    <g fill="#61DAFB">
        <path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/>
        <circle cx="420.9" cy="296.5" r="45.7"/>
        <path d="M520.5 78.1z"/>
    </g>
</svg></div>
    Love React? Check the new React version of this widget you can use right out of the box! <div><a href="https://goo.gl/DtrXHy" target="_blank">
    React Version of Simple Rating Widget</a></div>
  </div>
  
  
  
  
</footer>
!

CSS 

              
                body {
  font-family:"Open Sans", Helvetica, Arial, sans-serif;
  color:#555;
  max-width:680px;
  margin:0 auto;
  padding:0 20px;
}

* {
  -webkit-box-sizing:border-box;
  -moz-box-sizing:border-box;
  box-sizing:border-box;
}

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

.clearfix {
  clear:both;
}

.text-center {text-align:center;}

a {
  color: tomato;
  text-decoration: none;
}

a:hover {
  color: #2196f3;
}

pre {
display: block;
padding: 9.5px;
margin: 0 0 10px;
font-size: 13px;
line-height: 1.42857143;
color: #333;
word-break: break-all;
word-wrap: break-word;
background-color: #F5F5F5;
border: 1px solid #CCC;
border-radius: 4px;
}

.header {
  padding:20px 0;
  position:relative;
  margin-bottom:10px;
  
}

.header:after {
  content:"";
  display:block;
  height:1px;
  background:#eee;
  position:absolute; 
  left:30%; right:30%;
}

.header h2 {
  font-size:3em;
  font-weight:300;
  margin-bottom:0.2em;
}

.header p {
  font-size:14px;
}



#a-footer {
  margin: 20px 0;
}

.new-react-version {
  padding: 20px 20px;
  border: 1px solid #eee;
  border-radius: 20px;
  box-shadow: 0 2px 12px 0 rgba(0,0,0,0.1);
  
  text-align: center;
  font-size: 14px;
  line-height: 1.7;
}

.new-react-version .react-svg-logo {
  text-align: center;
  max-width: 60px;
  margin: 20px auto;
  margin-top: 0;
}





.success-box {
  margin:50px 0;
  padding:10px 10px;
  border:1px solid #eee;
  background:#f9f9f9;
}

.success-box img {
  margin-right:10px;
  display:inline-block;
  vertical-align:top;
}

.success-box > div {
  vertical-align:top;
  display:inline-block;
  color:#888;
}



/* Rating Star Widgets Style */
.rating-stars ul {
  list-style-type:none;
  padding:0;
  
  -moz-user-select:none;
  -webkit-user-select:none;
}
.rating-stars ul > li.star {
  display:inline-block;
  
}

/* Idle State of the stars */
.rating-stars ul > li.star > i.fa {
  font-size:2.5em; /* Change the size of the stars */
  color:#ccc; /* Color on idle state */
}

/* Hover state of the stars */
.rating-stars ul > li.star.hover > i.fa {
  color:#FFCC36;
}

/* Selected state of the stars */
.rating-stars ul > li.star.selected > i.fa {
  color:#FF912C;
}
!

JS 

              
                $(document).ready(function(){
  
  /* 1. Visualizing things on Hover - See next part for action on click */
  $('#stars li').on('mouseover', function(){
    var onStar = parseInt($(this).data('value'), 10); // The star currently mouse on
   
    // Now highlight all the stars that's not after the current hovered star
    $(this).parent().children('li.star').each(function(e){
      if (e < onStar) {
        $(this).addClass('hover');
      }
      else {
        $(this).removeClass('hover');
      }
    });
    
  }).on('mouseout', function(){
    $(this).parent().children('li.star').each(function(e){
      $(this).removeClass('hover');
    });
  });
  
  
  /* 2. Action to perform on click */
  $('#stars li').on('click', function(){
    var onStar = parseInt($(this).data('value'), 10); // The star currently selected
    var stars = $(this).parent().children('li.star');
    
    for (i = 0; i < stars.length; i++) {
      $(stars[i]).removeClass('selected');
    }
    
    for (i = 0; i < onStar; i++) {
      $(stars[i]).addClass('selected');
    }
    
    // JUST RESPONSE (Not needed)
    var ratingValue = parseInt($('#stars li.selected').last().data('value'), 10);
    var msg = "";
    if (ratingValue > 1) {
        msg = "Thanks! You rated this " + ratingValue + " stars.";
    }
    else {
        msg = "We will improve ourselves. You rated this " + ratingValue + " stars.";
    }
    responseMessage(msg);
    
  });
  
  
});


function responseMessage(msg) {
  $('.success-box').fadeIn(200);  
  $('.success-box div.text-message').html("<span>" + msg + "</span>");
}
!
999px

Console