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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 

              
                <nav data-uk-sticky id="items" class="uk-navbar">
  <label class="uk-navbar-content uk-hidden-small">Filter:</label>
  <ul class="uk-navbar-nav uk-hidden-small">
    <li data-uk-filter="" class="uk-active"><a href="#">ALL</a></li>
    <li data-uk-filter="blue"><a href="#">BLUE</a></li>
    <li data-uk-filter="green"><a href="#">GREEN</a></li>
  </ul>

  <label class="uk-navbar-content uk-hidden-small">Sort:</label>
  <ul class="uk-navbar-nav uk-hidden-small">
    <li data-uk-sort="numbers"><a href="#">NUMBERS <i class="uk-icon-sort-numeric-asc"></i></a></li>
    <li data-uk-sort="numbers:desc"><a href="#">NUMBERS <i class="uk-icon-sort-numeric-desc"></i></a></li>
    <li data-uk-sort="letters"><a href="#">LETTERS <i class="uk-icon-sort-alpha-asc"></i></a></li>
    <li data-uk-sort="letters:desc"><a href="#">LETTERS <i class="uk-icon-sort-alpha-desc"></i></a></li>
  </ul>
  <div data-uk-dropdown="{mode:'click'}">
    <a href="#" class="uk-navbar-toggle uk-visible-small"></a>
    <div class="uk-dropdown uk-dropdown-navbar">
      <ul class="uk-nav uk-nav-navbar">
        <li class="uk-nav-header">Filter:</li>
        <li data-uk-filter="" class="uk-active"><a href="#">ALL</a></li>
        <li data-uk-filter="blue"><a href="#">BLUE</a></li>
        <li data-uk-filter="green"><a href="#">GREEN</a></li>
        <li class="uk-nav-divider"></li>
      </ul>
      <ul class="uk-nav uk-nav-navbar">
        <li class="uk-nav-header">Sort:</li>
        <li data-uk-sort="numbers"><a href="#">NUMBERS <i class="uk-icon-sort-numeric-asc"></i></a></li>
        <li data-uk-sort="numbers:desc"><a href="#">NUMBERS <i class="uk-icon-sort-numeric-desc"></i></a></li>
        <li data-uk-sort="letters"><a href="#">LETTERS <i class="uk-icon-sort-alpha-asc"></i></a></li>
        <li data-uk-sort="letters:desc"><a href="#">LETTERS <i class="uk-icon-sort-alpha-desc"></i></a></li>
      </ul>                 
    </div>
  </div>        
</nav>

<div class="uk-container uk-container-center uk-margin-top">

  <div class="uk-grid-width-small-1-1 uk-grid-width-medium-1-4" data-uk-grid="{gutter: 20, controls: '#items', duration: 500}">

    <div data-uk-filter="blue" data-numbers="4" data-letters="A">
      <figure class="uk-thumbnail uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/1e90ff/fff&text=A+4">
        <div class="uk-overlay-panel  uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" data-uk-modal="{target:'#project-details'}" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
      <div id="project-details" class="uk-modal">
        <div class="uk-modal-dialog">
          <a class="uk-modal-close uk-close"></a>
          <div class="uk-modal-header"><h2>My Project Title</h2></div>
          <div class="uk-overflow-container">
            <img src="http://placehold.it/1200x800/1e90ff/fff&text=My+Project+Image">
            <p>
              Lorem ipsum dolor sit amet, mollis inciderint ei eam, esse senserit consequat eum at, at est bonorum omittam. Vel te corpora electram accommodare, no nisl ferri appetere est. Usu cu sale gubergren. Oratio detraxit sea id, ex quo adipisci repudiare laboramus. Dolor reprimique appellantur ei duo, eum at idque efficiantur. Cu ius ridens graeco doctus, inimicus postulant efficiantur pri te.

              Eam ea eligendi mnesarchum, mea dico mollis meliore no. Dico utamur duo eu. Ut brute suscipit patrioque ius. Ex recusabo postulant elaboraret mea, ei pri propriae patrioque similique, ad duo oratio facilisi definitionem. Eam ex alii populo causae, malis audire mediocritatem ut est.

              Est dictas vituperata ne. Ancillae consequat quo ea. His ea congue hendrerit vituperatoribus, eum cu alii esse dissentiet. Id his illum libris malorum. Ne vel tantas tamquam sententiae, veri possit mea et, cibo intellegam ne duo. Et duis quaeque usu. Per harum accusata eu, errem tantas definiebas nam no.

              Altera admodum eu mei, doming expetenda quo te, mucius putant duo ei. Est accusam efficiantur at. Has ipsum nusquam scribentur at, vis ridens impedit ut. At blandit singulis senserit ius. Et cum consul nusquam, dolor dictas dignissim pro et. Vix inani possim voluptatum ne. Ex eos convenire adversarium.

              Ius labore epicuri in. Nulla partem ut vix, vis cu vide noster oportere, putent philosophia vis te. Cu aperiam legimus definitiones mei, eros perfecto ex sit. An mel amet virtute lobortis. Latine ocurreret elaboraret id quo. Debet lobortis pri ut, at duo hinc menandri elaboraret, eum assum aeterno alienum in. Eum altera inermis interesset ea.
            </p>
            <p>
              Lorem ipsum dolor sit amet, mollis inciderint ei eam, esse senserit consequat eum at, at est bonorum omittam. Vel te corpora electram accommodare, no nisl ferri appetere est. Usu cu sale gubergren. Oratio detraxit sea id, ex quo adipisci repudiare laboramus. Dolor reprimique appellantur ei duo, eum at idque efficiantur. Cu ius ridens graeco doctus, inimicus postulant efficiantur pri te.

              Eam ea eligendi mnesarchum, mea dico mollis meliore no. Dico utamur duo eu. Ut brute suscipit patrioque ius. Ex recusabo postulant elaboraret mea, ei pri propriae patrioque similique, ad duo oratio facilisi definitionem. Eam ex alii populo causae, malis audire mediocritatem ut est.

              Est dictas vituperata ne. Ancillae consequat quo ea. His ea congue hendrerit vituperatoribus, eum cu alii esse dissentiet. Id his illum libris malorum. Ne vel tantas tamquam sententiae, veri possit mea et, cibo intellegam ne duo. Et duis quaeque usu. Per harum accusata eu, errem tantas definiebas nam no.

              Altera admodum eu mei, doming expetenda quo te, mucius putant duo ei. Est accusam efficiantur at. Has ipsum nusquam scribentur at, vis ridens impedit ut. At blandit singulis senserit ius. Et cum consul nusquam, dolor dictas dignissim pro et. Vix inani possim voluptatum ne. Ex eos convenire adversarium.

              Ius labore epicuri in. Nulla partem ut vix, vis cu vide noster oportere, putent philosophia vis te. Cu aperiam legimus definitiones mei, eros perfecto ex sit. An mel amet virtute lobortis. Latine ocurreret elaboraret id quo. Debet lobortis pri ut, at duo hinc menandri elaboraret, eum assum aeterno alienum in. Eum altera inermis interesset ea.
            </p>
          </div>
        </div>
      </div>
    </div>

    <div data-uk-filter="green" data-numbers="2" data-letters="C">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/9acd32/fff&text=C+2">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>

    <div data-uk-filter="blue" data-numbers="3" data-letters="D">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/1e90ff/fff&text=D+3">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>

    <div data-uk-filter="green" data-numbers="1" data-letters="B">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/9acd32/fff&text=B+1">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>        

    <div data-uk-filter="green" data-numbers="5" data-letters="G">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/9acd32/fff&text=G+5">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>   

    <div data-uk-filter="blue" data-numbers="6" data-letters="F">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/1e90ff/fff&text=F+6">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>   

    <div data-uk-filter="green" data-numbers="8" data-letters="E">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/9acd32/fff&text=E+8">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>   

    <div data-uk-filter="blue" data-numbers="7" data-letters="H">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/1e90ff/fff&text=H+7">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>   

    <div data-uk-filter="green" data-numbers="11" data-letters="L">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/9acd32/fff&text=L+11">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>   

    <div data-uk-filter="blue" data-numbers="9" data-letters="J">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/1e90ff/fff&text=J+9">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>   

    <div data-uk-filter="blue" data-numbers="12" data-letters="K">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/1e90ff/fff&text=K+12">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>   

    <div data-uk-filter="green" data-numbers="10" data-letters="I">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/9acd32/fff&text=I+10">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>    

    <div data-uk-filter="green" data-numbers="13" data-letters="N">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/9acd32/fff&text=N+13">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>   

    <div data-uk-filter="green" data-numbers="15" data-letters="O">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/9acd32/fff&text=O+15">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>   

    <div data-uk-filter="blue" data-numbers="14" data-letters="P">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/1e90ff/fff&text=P+14">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>   

    <div data-uk-filter="green" data-numbers="16" data-letters="M">
      <figure class="uk-thumbnail uk-thumbnail-expand uk-overlay uk-overlay-hover">
        <img class="uk-overlay-fade" src="http://placehold.it/1200x800/9acd32/fff&text=M+16">
        <div class="uk-overlay-panel uk-overlay-scale uk-flex uk-flex-center uk-flex-middle uk-text-center">
          <button class="uk-button" type="button">VIEW MORE</button>
        </div>
        <figcaption class="uk-thumbnail-caption">My Project</figcaption>
      </figure>
    </div>                         

  </div>

</div>
!

CSS 

              
                /*
NOTE: Only the first item has the modal overlay functionality
*/

/* This is to override a bizarre line in UIkit's navbar styles */
.uk-navbar-nav>li>a[href='#'] {
  cursor: pointer;
}
!

JS 

              
                // See:
// http://www.sitepoint.com/building-responsive-portfolio-uikit
!
999px

Console