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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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HTML 

              
                <header>
  <a href="https://fontawesome.com/" target="_blank"><h3><i class="fab fa-font-awesome"></i>Font Awesome</h3></a>
</header>
<main class="container">
  <div class="row">
    <div class="col-12 text-center">
      <h1 class="text-center mb-0">Custom Checklists</h1>
		<a id="open-modal-top" href="#" id="steps-cta"><i class="far fa-clipboard-list"></i><span class="d-none d-sm-inline">Step-by-Step </span>Guide</a>
    </div>
  </div>
  <div class="row">
    <div class="col-12 pb-0">
      <h4 class="text-center mb-0">Standard</h4>
    </div>
  </div>
  <div class="row lists">
    <div class="col-sm-6 col-md-4 offset-md-2 list-standard">
      <h2>Checklists</h2>
      <label class="checkbox checked">One
        <input type="checkbox" checked>
        <i class="fas fa-check-square"></i>
      </label>
      <label class="checkbox">Two
        <input type="checkbox">
        <i class="far fa-square"></i>
      </label>
      <label class="checkbox">Three
        <input type="checkbox">
        <i class="far fa-square"></i>
      </label>
      <label class="checkbox">Four
        <input type="checkbox">
        <i class="far fa-square"></i>
      </label>
    </div>
    <div class="col-sm-6 col-md-4 col-lg-3 list-standard">
      <h2>Radio Buttons</h2>
      <label class="checkbox checked">One
        <input type="radio" checked>
        <i class="fas fa-dot-circle"></i>
      </label>
      <label class="checkbox">Two
        <input type="radio">
        <i class="far fa-circle"></i>
      </label>
      <label class="checkbox">Three
        <input type="radio">
        <i class="far fa-circle"></i>
      </label>
      <label class="checkbox">Four
        <input type="radio">
        <i class="far fa-circle"></i>
      </label>
    </div>
  </div>
  <div class="row">
    <div class="col-12 pt-0 pb-0">
      <h4 class="text-center mb-0">Custom</h4>
    </div>
  </div>
  <div class="row lists">
    <div class="col-sm-6 col-md-4 offset-md-2 list-custom">
      <h2>Amenities</h2>
      <label class="checkbox green">Verified hosts
        <input type="checkbox">
        <i class="far fa-badge-check"></i>
      </label>
      <label class="checkbox checked">Bed
        <input type="checkbox" checked>
        <i class="fas fa-bed"></i>
      </label>
      <label class="checkbox">Bath
        <input type="checkbox">
        <i class="far fa-bath"></i>
      </label>
      <label class="checkbox">Outlets
        <input type="checkbox">
        <i class="fas fa-plug"></i>
      </label>
    </div>
    <div class="col-sm-6 col-md-4 col-lg-3 list-custom">
      <h2>Transportation</h2>
      <label class="checkbox checked">Taxi
        <input type="radio" checked>
        <i class="fas fa-taxi"></i>
      </label>
      <label class="checkbox">Truck
        <input type="radio">
        <i class="far fa-truck"></i>
      </label>
      <label class="checkbox">Train
        <input type="radio">
        <i class="far fa-train"></i>
      </label>
      <label class="checkbox">Plane
        <input type="radio">
        <i class="far fa-plane"></i>
      </label>
    </div>
  </div>
</main>
<footer>
  <a href="https://www.w3schools.com/howto/howto_css_custom_checkbox.asp" target="_blank" title="W3Schools How To Article"><i class="far fa-link"></i>W3Schools</a><a id="open-modal" href="#"><i class="far fa-question-circle"></i>Step-by-Step</a>
</footer>
<aside id="modal-wrapper" style="display: none;">
  <div id="modal">
    <div id="modal-inner">
      <h3>A JavaScript (jQuery) Solution to Custom Checklists</h3>
      <p>* This method assumes and requires you are using <a href="https://fontawesome.com" target="_blank" title="Font Awesome 5">Font Awesome 5</a> and have a <a href="https://fontawesome.com/pricing" target="_blank" title="Font Awesome 5 Pro">Pro license</a> for full access to all available icons and weight classes.</p>
      <hr><br>
      <ol>
        <li>
          <p>Set up an event listener for your custom lists. Make sure to target the appropriate list if you have multiple lists on the same page/form and want to use different styling for each.</p>
          <pre><code class="javascript">$('.custom-checklist').on('click', '[type="checkbox"], [type="radio"]', function() {});</code></pre>
        </li>
        <li>
          <p>Check whether the list being interacted with is a checkbox list or radio button list, and if it is a checkbox list, check whether the checkbox is being checked or unchecked.</p>
          <pre><code class="javascript">$('.custom-checklist').on('click', '[type="checkbox"], [type="radio"]', function() {
  if ($(this).attr('type') == 'checkbox') { // checkbox list
    if ($(this).is(':checked')) {} // checkbox being checked
  } else {} // checkbox being unchecked
  else if ($(this).attr('type') == 'radio') {} // radio button list
});</code></pre>
        </li>
        <li>
          <p>On click, if the checkbox/radio is being checked, apply the checked styling using the data-icon and data-prefix attributes on the dynamically generated SVG element for that icon. If you are using a radio button list, make sure to unstyle all sibling radio buttons within the adjacent labels, and if a checkbox is being unchecked, apply the unchecked styling the same way as checked.</p>
          <pre><code class="javascript">$('.custom-checklist').on('click', '[type="checkbox"], [type="radio"]', function() {
  if ($(this).attr('type') == 'checkbox') { // checkbox list
    if ($(this).is(':checked')) { // checkbox being checked, style as checked
      $(this).siblings('[data-icon]')
        .attr({
          'data-icon': 'check-square',
          'data-prefix': 'fas'
        })
        .parent().addClass('checked');
    } else { // checkbox being unchecked, style as unchecked
      $(this).siblings('[data-icon]')
        .attr({
          'data-icon': 'square',
          'data-prefix': 'far'
        })
        .parent().removeClass('checked');
    }
  } else if ($(this).attr('type') == 'radio') { // radio button list
    $(this).siblings('[data-icon]')
      .attr({
        'data-icon': 'dot-circle',
        'data-prefix': 'fas'
      })
      .parent()
      .addClass('checked')
      .siblings().each(function() {
        $(this)
          .removeClass('checked');
        .children('[data-icon]')
          .attr({
            'data-icon': 'circle',
            'data-prefix': 'far'
          });
      });
  }
});</code></pre>
        </li>
        <li>
          <p>If you are using Font Awesome 5's CSS solution instead of the standard JS+SVG solution, simply modify this function to work with the Font Awesome 5 classes and weights as explained in the Font Awesome 5's official CSS <a href="https://fontawesome.com/how-to-use/on-the-web/referencing-icons/basic-use" target="_blank" title="Font Awesome 5 CSS Basic Use">documentation</a></p>
          <pre><code class="javascript">$('.custom-checklist').on('click', '[type="checkbox"], [type="radio"]', function() {
  if ($(this).attr('type') == 'checkbox') { // checkbox list
    if ($(this).is(':checked')) { // checkbox being checked, style as checked
      $(this).siblings('i')
        .removeClass('far, fa-square')
        .addClass('fas, fa-check-square')
        .parent().addClass('checked');
    } else { // checkbox being unchecked, style as unchecked
      $(this).siblings('i')
        .removeClass('fas, fa-check-square')
        .addClass('far, fa-square')
        .parent().removeClass('checked');
    }
  } else if ($(this).attr('type') == 'radio') { // radio button list
    $(this).siblings('i')
      .removeClass('far, fa-circle')
      .addClass('fas, fa-dot-circle')
      .parent()
      .addClass('checked')
      .siblings().each(function() {
        $(this)
          .removeClass('checked');
        .children('i')
          .removeClass('fas, fa-dot-circle')
          .addClass('far, fa-circle')
      });
  }
});</code></pre>
        </li>
        <li>
          <p>To build a custom checklist with different icons, set the different icons in the HTML and then change the weight of the icons from fal/far to fas to fill the icon when checked or selected. Any additional stylistic customizations can be made your CSS stylesheet. For a more robust demonstration of how this code would be built out, look at and play with the JavaScript for this pen.</p>
        </li>
      </ol>
      <hr>
      <p>The web is a beautiful place if you'd only open your browser. Checklists should be no exception. Want to take it one step further? Check out Codrops article on SVG <a href="https://tympanus.net/codrops/2013/10/15/animated-checkboxes-and-radio-buttons-with-svg/" target="_blank" title="Animated Checkboxes and Radio Buttons with SVG">animated checklists</a>.</p>
    </div>
    <a id="close-modal" href="#"><i class="fas fa-times"></i></a>
  </div>
</aside>
!

CSS 

              
                @media (min-width: 768px) {
	.container {
		max-width: 720px !important;
	}
}

body {
	padding: 64px 15px 15px;
	font-family: "Nunito", arial;
	font-weight: 600;
	color: #455a64;
	background-color: #f1f3f5;
}

a {
	color: #adb5bd;
	text-decoration: none;
}

a:hover {
	color: #339af0;
	text-decoration: none;
}

header, footer {
	text-align: center;
}

header {
	margin-bottom: 32px;
}

footer {
	margin-top: 24px;
}

header a, footer a {
	display: inline-block;
	padding: 0 14px;
}

footer a {
	font-size: 16px;
}

footer a:not(:last-child) {
	border-right: 2px dashed #c9cfd4;
}

header [data-icon], footer [data-icon] {
	box-sizing: content-box;
}

header [data-icon] {
	padding-right: 12px;
}

footer [data-icon], #open-modal-top [data-icon] {
	padding-right: 8px;
	box-sizing: content-box;
}

.container {
	position: relative;
	padding: 64px 15px;
	background-color: #fff;
	border-radius: .25rem;
	box-shadow: 0 5px 10px rgba(0,0,0,.05);
	overflow: hidden;
}

.container:before, #modal-inner:before, .container:after {
	content: " ";
	position: absolute;
	background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/1580009/confetti.svg?vsn=d);
	background-position: top;
	background-repeat: repeat-x;
	width: 100%;
	height: .75rem;
	left: 0;
}

.container:before, #modal-inner:before { top: 0; }
.container:after { bottom: 0; } 

.row + .row [class*="col-"] {
	padding: 32px;
}

h1 { color: #ff7502; }

h2 {
	margin-bottom: 16px;
	font-size: 18px;
	color: #90a4ae;
	letter-spacing: 4px;
	text-transform: uppercase;
	font-weight: 800;
	white-space: nowrap;
}

h4 {
	font-size: 20px;
	font-weight: 700;
	color: #51646e;
	text-transform: uppercase;
	letter-spacing: 3px;
}

.checkbox {
	display: block;
	position: relative;
	padding-left: 32px;
	margin-bottom: 12px;
	cursor: pointer;
	font-size: 22px;
	user-select: none;
	transition: padding-left 0.15s ease-in-out;
}

.checkbox:hover {
	padding-left: 35px;
}

.checkbox input {
	position: absolute;
	opacity: 0;
	cursor: pointer;
}

.row.lists [data-icon] {
	position: absolute;
	top: 2px;
	left: 0;
	height: 25px;
	width: 25px;
	color: #78909c;
}

.checkbox:hover [data-icon] {
	color: #81d4fa;
}

.checkbox:hover,
.checkbox.checked,
.checkbox.checked [data-icon] {
	color: #03a9f4;
}

.checkbox.green:hover [data-icon] {
	color: #66ef90;
}

.checkbox.green:hover,
.checkbox.green.checked,
.checkbox.green.checked [data-icon] {
	color: #03d343;
}

#modal-wrapper {
	display: flex;
	align-items: center;
	justify-content: center;
	position: fixed;
	top: 0;
	left: 0;
	width: 100vw;
	height: 100vh;
	background-color: rgba(241, 243, 245, 0.85);
}

#modal {
	display: block;
	position: relative;
	width: 90vw;
	max-width: 900px;
	height: 90vh;
	overflow: visible;
	border-radius: .25rem;
	box-shadow: 0 5px 10px rgba(0,0,0,.05);
	background: #fff;
}

#modal-inner {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	padding: calc(32px + 1vw);
	overflow: scroll;
}

#modal-wrapper ol {
	list-style: none;
	counter-reset: item;
}

#modal-wrapper li {
	counter-increment: item;
	margin-bottom: 5px;
	position: relative;
}

#modal-wrapper li:before {
	content: counter(item);
	background: #339af0;
	border-radius: 100%;
	color: white;
	width: 28px;
	height: 28px;
	font-size: 16px;
	text-align: center;
	align-items: center;
	justify-content: center;
	font-weight: 700;
	display: flex;
	position: absolute;
	top: -3px;
	left: -8px;
	transform: translateX(-100%);
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

pre code.hljs {
	padding: 15px;
	border-radius: 5px;
	overflow: scroll;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

#open-modal, #close-modal {
	cursor: pointer;
}

#close-modal {
	display: flex;
	height: 36px;
	width: 36px;
	background: #ef272f;
	border-radius: 50%;
	position: absolute;
	top: 0;
	right: 0;
	transform: translate(50%, -50%) scale(1.001);
	z-index: 999;
	text-align: center;
	align-items: center;
	justify-content: center;
	font-size: 22px;
	color: #fff;
	box-shadow: 0 5px 10px -3px rgba(255, 255, 255,.5), 0 5px 10px -3px rgba(0, 0, 0,.5);
	transition: all 0.1s ease-in-out;
}

#close-modal:hover {
	transform: translate(50%, -50%) scale(1.15);
}

#close-modal:hover:active {
	transform: translate(50%, -50%) scale(0.85);
}
!

JS 

              
                $(function() {
	$('input[type="checkbox"], input[type="radio"]').each(function() {
		if ($(this).closest('[class*="list-"]').is('.list-standard')) {
			if ($(this).is(':checked')) {
				$(this).siblings('[data-icon]').attr('data-prefix', 'fas').closest('.checkbox').addClass('checked');
				if ($(this).is('[type="checkbox"]')) {
					$(this).siblings('[data-icon]').attr('data-icon', 'check-square');
				} else if ($(this).is('[type="radio"]')) {
					$(this).siblings('[data-icon]').attr('data-icon', 'dot-circle').closest('.checkbox').siblings('.checkbox').removeClass('checked').children('[type="radio"]').prop('checked', false).siblings('[data-icon]').attr({'data-icon': 'circle', 'data-prefix': 'far'});
				}
			} else {
				$(this).siblings('[data-icon]').attr('data-prefix', 'far').closest('.checkbox').removeClass('checked');
				if ($(this).is('[type="checkbox"]')) {
					$(this).siblings('[data-icon]').attr('data-icon', 'square');
				} else if ($(this).is('[type="radio"]')) {
					$(this).siblings('[data-icon]').attr('data-icon', 'circle');
				}
			}
		} else if ($(this).closest('[class*="list-"]').is('.list-custom')) {
			if ($(this).is(':checked')) {
				$(this).siblings('[data-icon]').attr('data-prefix', 'fas').closest('.checkbox').addClass('checked');
				if ($(this).is('[type="radio"]')) {
					$(this).siblings('[data-icon]').closest('.checkbox').siblings('.checkbox').removeClass('checked').children('[type="radio"]').prop('checked', false).siblings('[data-icon]').attr('data-prefix', 'far');
				}
			} else {
				$(this).siblings('[data-icon]').attr('data-prefix', 'far').closest('.checkbox').removeClass('checked');
			}
		}
	});
	$('input[type="checkbox"], input[type="radio"]').on('change', function() {
		if ($(this).closest('[class*="list-"]').is('.list-standard')) {
			if ($(this).is(':checked')) {
				$(this).siblings('[data-icon]').attr('data-prefix', 'fas').closest('.checkbox').addClass('checked');
				if ($(this).is('[type="checkbox"]')) {
					$(this).siblings('[data-icon]').attr('data-icon', 'check-square');
				} else if ($(this).is('[type="radio"]')) {
					$(this).siblings('[data-icon]').attr('data-icon', 'dot-circle').closest('.checkbox').siblings('.checkbox').removeClass('checked').children('[type="radio"]').prop('checked', false).siblings('[data-icon]').attr({'data-icon': 'circle', 'data-prefix': 'far'});
				}
			} else {
				$(this).siblings('[data-icon]').attr('data-prefix', 'far').closest('.checkbox').removeClass('checked');
				if ($(this).is('[type="checkbox"]')) {
					$(this).siblings('[data-icon]').attr('data-icon', 'square');
				} else if ($(this).is('[type="radio"]')) {
					$(this).siblings('[data-icon]').attr('data-icon', 'circle');
				}
			}
		} else if ($(this).closest('[class*="list-"]').is('.list-custom')) {
			if ($(this).is(':checked')) {
				$(this).siblings('[data-icon]').attr('data-prefix', 'fas').closest('.checkbox').addClass('checked');
				if ($(this).is('[type="radio"]')) {
					$(this).siblings('[data-icon]').closest('.checkbox').siblings('.checkbox').removeClass('checked').children('[type="radio"]').prop('checked', false).siblings('[data-icon]').attr('data-prefix', 'far');
				}
			} else {
				$(this).siblings('[data-icon]').attr('data-prefix', 'far').closest('.checkbox').removeClass('checked');
			}
		}
	});
	// open & close modal
	$('#open-modal, #open-modal-top').on('click', function(e) {
		e.preventDefault();
		$('aside').fadeIn(200);
	});
	$('#close-modal').on('click', function(e) {
		e.preventDefault();
		$('aside').fadeOut(200);
	});
	// generating code blocks for walkthrough modal
	$('pre code').each(function(i, block) { hljs.highlightBlock(block); });
});
!
999px

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