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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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You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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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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You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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HTML 

              
                <main>
<section>
 <time datetime="2015-07-26" class="blank"><span class="caldate">26</span></time>
 <time datetime="2015-07-27" class="hidden">
  <a href="http://thenewcode.com/1054/SVG-Meetup-Presentation-Interactive-Imagemaps"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/svg-meetup-thumb.png" alt="SVG Meetup Presentation: Interactive Imagemaps" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/svg-meetup-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/svg-meetup-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/svg-meetup-2x.png 125w">
   <span
   class="caldate">27</span><span class="title">Interactive Imagemaps Presentation</span></a>
 </time>
 <time datetime="2015-07-28" class="hidden">
  <a href="http://thenewcode.com/1055/12-Palette-Extractors-and-Resources-for-Site-Color-Inspiration"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peacock-thumb.jpg" alt="12 Palette Extractors and Resources for Site Color Inspiration" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peacock-thumb.jpg 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peacock-2x-thumb.jpg 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peacock-2x.jpg 125w">
   <span
   class="caldate">28</span><span class="title">Palette Extractors & Resources</span></a>
 </time>
 <time datetime="2015-07-29" class="blank"><span class="caldate">29</span></time>
 <time datetime="2015-07-30" class="hidden">
  <a href="http://thenewcode.com/1056/Better-Diagrams-with-SVG-and-Blend-Modes"><img src="http://thenewcode.com/assets/svg/venn.svg" alt><span class="caldate">30</span><span class="title"> SVG Diagrams w/ Blend Modes</span></a>
 </time>
 <time datetime="2015-07-31" class="blank"><span class="caldate">31</span></time>
 <time datetime="2015-08-01" class="blank"><span class="caldate">01</span></time>
 <time datetime="2015-08-02" class="hidden">
  <a href="http://thenewcode.com/1057/SVG-Patterns-of-Japan"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/waves-thumb.png" alt="SVG Patterns of Japan" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/waves-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/waves-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/waves-2x.png 125w">
    
   <span
   class="caldate">02</span><span class="title">SVG Patterns of Japan</span></a>
 </time>
 <time datetime="2015-08-03" class="hidden">
  <a href="http://thenewcode.com/1058/Overlapping-Action-with-CSS-Animation"><img src="http://thenewcode.com/assets/svg/redbars.svg" alt><span class="caldate">03</span><span class="title">CSS Overlapping Animation</span></a>
 </time>
 <time datetime="2015-08-04" class="blank"><span class="caldate">04</span></time>
 <time datetime="2015-08-05" class="blank"><span class="caldate">05</span></time>
 <time datetime="2015-08-06" class="hidden">
  <a href="http://thenewcode.com/1059/Responsive-Image-Hinting-Using-the-w-Descriptor"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/toubana-diver-thumb.jpg" alt="Responsive Image Hinting: Using the w Descriptor" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/toubana-diver-thumb.jpg 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/toubana-diver-2x-thumb.jpg 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/toubana-diver-2x.jpg 125w">
   <span
   class="caldate">06</span><span class="title">Using the w Descriptor</span></a>
 </time>
 <time datetime="2015-08-07" class="blank"><span class="caldate">07</span></time>
 <time datetime="2015-08-08" class="blank"><span class="caldate">08</span></time>
 <time datetime="2015-08-09" class="hidden">
  <a href="http://thenewcode.com/1060/SVG-Patterns-of-Africa"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/african-patterns-thumb.png" alt="SVG Patterns of Africa" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/african-patterns-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/african-patterns-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/african-patterns-2x-thumb.png 125w">
   <span
   class="caldate">09</span><span class="title">SVG African Patterns</span></a>
 </time>
 <time datetime="2015-08-10" class="hidden">
  <a href="http://thenewcode.com/1061/Bokeh-Backgrounds-with-SVG-and-JS"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bokeh-thumb.png" alt="Bokeh Backgrounds with SVG and JS" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bokeh-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bokeh-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bokeh-2x.png 125w">
   <span
   class="caldate">10</span><span class="title">SVG Bokeh Backgrounds</span></a>
 </time>
 <time datetime="2015-08-11" class="blank"><span class="caldate">11</span></time>
 <time datetime="2015-08-12" class="blank"><span class="caldate">12</span></time>
 <time datetime="2015-08-13" class="hidden">
  <a href="http://thenewcode.com/1062/Scribble-Image-Reveal-with-SVG-and-Blend-Modes"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/olga-thumb.jpg" alt="“Scribble” Image Reveal with SVG and Blend Modes" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/olga-thumb.jpg 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/olga-2x-thumb.jpg 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/olga-2x.jpg 125w">
   <span
   class="caldate">13</span><span class="title">“Scribble” Image Reveal</span></a>
 </time>
 <time datetime="2015-08-14" class="blank"><span class="caldate">14</span></time>
 <time datetime="2015-08-15" class="blank"><span class="caldate">15</span></time>
 <time datetime="2015-08-16" class="blank"><span class="caldate">16</span></time>
 <time datetime="2015-08-17" class="hidden">
  <a href="http://thenewcode.com/1063/Techniques-and-Treatments-for-Background-Retina-Images"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/birds-on-wire-thumb.png" alt="Techniques and Treatments for Background Retina Images" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/birds-on-wire-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/birds-on-wire-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/birds-on-wire-2x.png 125w">
   <span
   class="caldate">17</span><span class="title">Background Retina Images</span></a>
 </time>
 <time datetime="2015-08-18" class="blank"><span class="caldate">18</span></time>
 <time datetime="2015-08-19" class="hidden">
  <a href="http://thenewcode.com/1064/Classical-Greek-Geometric-Borders-In-SVG"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/greek-geometrics-thumb.png" alt="Classical Greek Geometric Borders In SVG" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/greek-geometrics-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/greek-geometrics-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/greek-geometrics-2x.png 125w">
   <span
   class="caldate">19</span><span class="title">SVG Greek Geometric Borders</span></a>
 </time>
 <time datetime="2015-08-20" class="blank"><span class="caldate">20</span></time>
 <time datetime="2015-08-21" class="blank"><span class="caldate">21</span></time>
 <time datetime="2015-08-22" class="blank"><span class="caldate">22</span></time>
 <time datetime="2015-08-23" class="hidden">
  <a href="http://thenewcode.com/1065/Better-Image-Borders-with-Blend-Modes"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peugot-thumb.jpg" alt="Better Image Borders with Blend Modes" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peugot-thumb.jpg 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peugot-2x-thumb.jpg 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/peugot-2x.jpg 125w">
   <span
   class="caldate">23</span><span class="title">Blend Mode Borders</span></a>
 </time>
 <time datetime="2015-08-24" class="hidden">
  <a href="http://thenewcode.com/1/Welcome-to-The-New-Code"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/the-new-code-thumb.png" alt="Welcome to The New Code" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/the-new-code-thumb.png 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/the-new-code-2x-thumb.png 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/the-new-code-square-2x.png 125w">
   <span
   class="caldate">24</span><span class="title">The New Code</span></a>
 </time>
 <time datetime="2015-08-25" class="blank"><span class="caldate">25</span></time>
 <time datetime="2015-08-26" class="hidden">
  <a href="http://thenewcode.com/2/Precognitive-Pages-Using-Resource-Hints-to-Accelerate-Site-Performance"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/alexander-thumb.jpg" alt="Precognitive Pages: Using Resource Hints to Accelerate Site Performance" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/alexander-thumb.jpg 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/alexander-2x-thumb.jpg 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/alexander-2x.jpg 125w">
   <span
   class="caldate">26</span><span class="title">Using Resource Hints</span></a>
 </time>
 <time datetime="2015-08-27" class="blank"><span class="caldate">27</span></time>
 <time datetime="2015-08-28" class="hidden">
  <a href="http://thenewcode.com/4/In-Other-Words-Using-the-blockquote-cite-and-q-elements"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bertrand-russell-thumb.jpg" alt="In Other Words: Using the blockquote, cite and q elements" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bertrand-russell-thumb.jpg 250w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bertrand-russell-2x-thumb.jpg 500w, https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/bertrand-russell-2x-thumb.jpg 125w">
   <span
   class="caldate">28</span><span class="title">blockquote, cite and q</span></a>
 </time>
 <time datetime="2015-08-29" class="blank"><span class="caldate">29</span></time>
 <time datetime="2015-08-30" class="blank"><span class="caldate">30</span></time>
 <time datetime="2015-08-31" class="blank"><span class="caldate">31</span></time>
 <time datetime="2015-09-01" class="blank"><span class="caldate">01</span></time>
</section>
</main>
!

CSS 

              
                body { 
  background: #111;
  font-family: Avenir, Helvetica, sans-serif;
}
main a { text-decoration: none; }
section {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-flex-flow: wrap;
      -ms-flex-flow: wrap;
          flex-flow: wrap;
  font-size: 0;
}

section time {
  -webkit-box-flex: 1;
  -webkit-flex: 1;
-webkit-flex: 1 1 14.2857%;
      -ms-flex: 1;
          flex: 1;
  min-width: 14.2857%;
  max-width: 14.2857vw;
  position: relative;
  font-size: 1.8vw;
  line-height: 0;
  -webkit-transition: .35s opacity;
          transition: .35s opacity;
}
section time.blank {
    min-height: 14vw; 
}
section time a { 
    display: inline-block; 
    width: 100%; height: 100%; 
    position: inherit;
    border-bottom: none;
    outline: none;
    }
section time span { position: absolute; }
span.caldate { 
    top: 10%; left: 7px; 
    z-index: 2;
    }
section time.blank span.caldate {   
  color: #333; 
}
section time a span.title { 
    width: 100%; height: 100%;
    line-height: 1.1;
    left: 0; top: 0; padding-left: 5%;
    padding-right: 5%;
    padding-top: 20%; opacity: 0;
    -webkit-transition: .4s opacity;
    transition: .4s opacity;
}
section time:hover a span.title { 
    background: rgba(0,0,0,0.8);
    opacity: 1;
}
section time a:hover {
    border-bottom: none;
}
time:not(.blank) span { 
    color: #fff; text-shadow: 1px 1px 1px rgba(0,0,0,0.8);
}
section time a img { width: 100%; }

.hidden { opacity: 0; }

@media all and (max-width: 950px) {
    section time.blank { display: none; }
    section time { 
        min-width: 20%;
        max-height: 20vw;
        max-width: 20vw;
        font-size: 3vw;
    }
}
@media all and (max-width: 750px) {
    section time { 
        min-width: 33%;
        max-height: 33vw;
        font-size: 5vw;
    }
}
@media all and (max-width: 450px) {
    section time { 
        min-width: 50%;
        max-height: 50vw;
        font-size: 5vw;
    }
}
!

JS 

              
                var dates = document.querySelectorAll("section time.hidden");
    var i = 1;
    Array.prototype.forEach.call(dates, function(caldate) {
        setTimeout(function(){ caldate.classList.remove("hidden") }, 250*i)
        i++;
})
!
999px

Console