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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-.

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About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

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About External Resources

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

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

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HTML

            
              <div id="snow">
 <!-- Holiday Music -- Removed because it was too heavy. . .<audio controls="controls">
  <source src="track.ogg" type="audio/ogg" />
  <source src="http://www.amclassical.com/mp3/amclassical_jingle_bells.mp3" type="audio/mpeg" />
Your browser does not support the audio element.
</audio> -->
      <!-- Jingle Sound -->
	<!--<audio class="jingle-bells" style="display:none;" controls="controls" preload="auto">
				<source src="https://jenny-smith-dyhg.squarespace.com/s/jingling-bells.mp3"></source>
  		<source src="audio/beep.ogg"></source>
				Your browser isn't invited for super fun time.
			</audio>-->
     <!-- / End of Jingle Sound -->
    <div class="box">
      <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/happy-holiday.png" width="65%" height="auto" alt="happy holidays" />
      <h2 class="from-line">from <a href="http://netvu.org/" target="blank"><img src="https://netvu.informz.net/netvu/data/images/netvu-logo-250.png" alt="NetVU" /></a></h2>
      <p class="banner-text">
      This holiday season, we want to take the time to look back on a year of NetVU membership and thank you for being part of it! Open each of the 25 doors to see what we've accomplished this year with your help. </p>
</div>

<!-- Popup Door 1 -->
<div id="video" class="lightbox video" onclick="hideVideo('video','youtube')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video','youtube')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube" width="960" height="540" src="https://www.youtube.com/embed/cI8rlUV48Ek?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>

<!-- Popup Door 2 -->
<div id="video2" class="lightbox video" onclick="hideVideo('video2','youtube2')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video2','youtube2')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube2" width="960" height="540" src="https://www.youtube.com/embed/-1LWp1J3STY?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>

<!-- Popup Door 3 -->
<div id="video3" class="lightbox video" onclick="hideVideo('video3','youtube3')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video3','youtube3')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube3" width="960" height="540" src="https://www.youtube.com/embed/xMrLZzBVQD8?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>
<!-- Popup Door 4 -->
<div id="video4" class="lightbox video" onclick="hideVideo('video4','youtube4')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video4','youtube4')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube4" width="960" height="540" src="https://www.youtube.com/embed/fRKh3JaB5Ec?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>
<!-- Popup Door 5 -->
<div id="video5" class="lightbox video" onclick="hideVideo('video5','youtube5')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video5','youtube5')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube5" width="960" height="540" src="https://www.youtube.com/embed/g_r5pULUMsk?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>

<!-- Popup Door 6 -->
<div id="video6" class="lightbox video" onclick="hideVideo('video6','youtube6')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video6','youtube6')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube6" width="960" height="540" src="https://www.youtube.com/embed/B-SEdufYAZ4?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>
<!-- Popup Door 7 -->
<div id="video7" class="lightbox video" onclick="hideVideo('video7','youtube7')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video7','youtube7')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube7" width="960" height="540" src="https://www.youtube.com/embed/2fseqLm3uQA?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>

<!-- Popup Door 8 -->
<div id="video8" class="lightbox video" onclick="hideVideo('video8','youtube8')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video8','youtube8')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube8" width="960" height="540" src="https://www.youtube.com/embed/5UJ2iVMnHHw?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>
<!-- Popup Door 9 -->
<div id="video9" class="lightbox video" onclick="hideVideo('video9','youtube9')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video9','youtube9')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube9" width="960" height="540" src="https://www.youtube.com/embed/lP1OveB-bCA?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>
<!-- Popup Door 10 -->
<div id="video10" class="lightbox video" onclick="hideVideo('video10','youtube10')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video10','youtube10')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube10" width="960" height="540" src="https://www.youtube.com/embed/LKRbx1WRTgU?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>

<!-- Popup Door 11 -->
<div id="video11" class="lightbox video" onclick="hideVideo('video11','youtube11')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video11','youtube11')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube11" width="960" height="540" src="https://www.youtube.com/embed/AWKiQH9PVio?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>
<!-- Popup Door 12 -->
<div id="video12" class="lightbox video" onclick="hideVideo('video12','youtube12')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video12','youtube12')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube12" width="960" height="540" src="https://www.youtube.com/embed/3-Y85996Xq4?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>

<!-- Popup Door 13 -->
<div id="video13" class="lightbox video" onclick="hideVideo('video13','youtube13')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video13','youtube13')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube13" width="960" height="540" src="https://www.youtube.com/embed/OMvJc_50A2Q?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>

<!-- Popup Door 14 -->
<div id="video14" class="lightbox video" onclick="hideVideo('video14','youtube14')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video14','youtube14')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube14" width="960" height="540" src="https://www.youtube.com/embed/d6-FC2LTu9w?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>

<!-- Popup Door 15 -->
<div id="video15" class="lightbox video" onclick="hideVideo('video15','youtube15')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video15','youtube15')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube15" width="960" height="540" src="https://www.youtube.com/embed/DvlsQ390eL4?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>

<!-- Popup Door 16 -->
<div id="video16" class="lightbox video" onclick="hideVideo('video16','youtube16')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video16','youtube16')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube16" width="960" height="540" src="https://www.youtube.com/embed/dJMEgQgszGc?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>


<!-- Popup Door 17 -->
<div id="video17" class="lightbox video" onclick="hideVideo('video17','youtube17')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video17','youtube17')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube17" width="960" height="540" src="https://www.youtube.com/embed/H3YAmoKWOD4?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>

<!-- Popup Door 18 -->
<div id="video18" class="lightbox video" onclick="hideVideo('video18','youtube18')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video18','youtube18')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube18" width="960" height="540" src="https://www.youtube.com/embed/2Duj0bzMRZM?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>

<!-- Popup Door 19 -->
<div id="video19" class="lightbox video" onclick="hideVideo('video19','youtube19')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video19','youtube19')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube19" width="960" height="540" src="https://www.youtube.com/embed/YpNSfkii31s?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>


<!-- Popup Door 20 -->
<div id="video20" class="lightbox video" onclick="hideVideo('video20','youtube20')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video20','youtube20')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube20" width="960" height="540" src="https://www.youtube.com/embed/tXbk_it4vSM?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>

<!-- Popup Door 21 -->
<div id="video21" class="lightbox video" onclick="hideVideo('video21','youtube21')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video21','youtube21')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube21" width="960" height="540" src="https://www.youtube.com/embed/FV_RI82EeLM?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>


<!-- Popup Door 22 -->
<div id="video22" class="lightbox video" onclick="hideVideo('video22','youtube22')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video22','youtube22')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube22" width="960" height="540" src="https://www.youtube.com/embed/YQbiEnMNVEA?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>


<!-- Popup Door 23 -->
<div id="video23" class="lightbox video" onclick="hideVideo('video23','youtube23')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video23','youtube23')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube23" width="960" height="540" src="https://www.youtube.com/embed/rK1FPmjOHeM?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>


<!-- Popup Door 24 -->
<div id="video24" class="lightbox video" onclick="hideVideo('video24','youtube24')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video24','youtube24')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube24" width="960" height="540" src="https://www.youtube.com/embed/39b3FgH2Okg?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>

<!-- Popup Door 25 -->
<div id="video25" class="lightbox video" onclick="hideVideo('video25','youtube25')">
  <div class="lightbox-container">  
    <div class="lightbox-content">
      <button onclick="hideVideo('video25','youtube25')" class="lightbox-close">
        Close | ✕
      </button>
      <div class="video-container">
        <iframe id="youtube25" width="960" height="540" src="https://www.youtube.com/embed/YaxXTgVtENk?showinfo=0&rel=0" frameborder="0" allowfullscreen></iframe>
      </div>      
      
    </div>
  </div>
</div>


<div class="demo-holder animated fadeInUp">
  <main>
    <!-- Door 1 -->
    <div class="day" onclick="void(0)">
      <div class="door">
        <h2>1</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup1" onclick="revealVideo('video','youtube')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/1.png" width="100%" height="auto" alt="Happy Holidays - Door 1" /></a></div>
      </div>
    </div>
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>2</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup2" onclick="revealVideo('video2','youtube2')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/2.png" width="100%" height="auto" alt="Happy Holidays - Door 2" /></a></div>
      </div>
    </div>
    <div class="day" onclick="void(0)">
      <div class="door">
        <h2>3</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup3" onclick="revealVideo('video3','youtube3')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/3.png" width="100%" height="auto" alt="Happy Holidays - Door 3" /></a></div>
      </div>
    </div>
    <div class="day" onclick="void(0)">
      <div class="door">
        <h2>4</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup4" onclick="revealVideo('video4','youtube4')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/4.png" width="100%" height="auto" alt="Happy Holidays - Door 4" /></a></div>
      </div>
    </div>
    <div class="day" onclick="void(0)">
      <div class="door">
        <h2>5</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup5" onclick="revealVideo('video5','youtube5')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/5.png" width="100%" height="auto" alt="Happy Holidays - Door 5" /></a></div>
      </div>
    </div>
    <div class="day" onclick="void(0)">
      <div class="door">
        <h2>6</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup6" onclick="revealVideo('video6','youtube6')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/6.png" width="100%" height="auto" alt="Happy Holidays - Door 6" /></a></div>
      </div>
    </div>
    <div class="day" onclick="void(0)">
      <div class="door">
        <h2>7</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup7" onclick="revealVideo('video7','youtube7')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/7.png" width="100%" height="auto" alt="Happy Holidays - Door 7" /></a></div>
      </div>
    </div>
    <div class="day" onclick="void(0)">
      <div class="door">
        <h2>8</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup8" onclick="revealVideo('video8','youtube8')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/8.png" width="100%" height="auto" alt="Happy Holidays - Door 8" /></a></div>
      </div>
    </div>
    <div class="day" onclick="void(0)">
      <div class="door">
        <h2>9</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup9" onclick="revealVideo('video9','youtube9')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/9.png" width="100%" height="auto" alt="Happy Holidays - Door 9" /></a></div>
      </div>
    </div>
    <div class="day" onclick="void(0)">
      <div class="door">
        <h2>10</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup10" onclick="revealVideo('video10','youtube10')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/10.png" width="100%" height="auto" alt="Happy Holidays - Door 10" /></a></div>
      </div>
    </div>
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>11</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup11" onclick="revealVideo('video11','youtube11')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/11.png" width="100%" height="auto" alt="Happy Holidays - Door 11" /></a></div>
      </div>
    </div>
    
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>12</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup12" onclick="revealVideo('video12','youtube12')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/12.png" width="100%" height="auto" alt="Happy Holidays - Door 12" /></a></div>
      </div>
    </div>
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>13</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup13" onclick="revealVideo('video13','youtube13')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/13.png" width="100%" height="auto" alt="Happy Holidays - Door 13" /></a></div>
      </div>
    </div>
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>14</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup14" onclick="revealVideo('video14','youtube14')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/14.png" width="100%" height="auto" alt="Happy Holidays - Door 14" /></a></div>
      </div>
    </div>
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>15</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup15" onclick="revealVideo('video15','youtube15')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/15.png" width="100%" height="auto" alt="Happy Holidays - Door 15" /></a></div>
      </div>
    </div>
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>16</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup16" onclick="revealVideo('video16','youtube16')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/16.png" width="100%" height="auto" alt="Happy Holidays - Door 16" /></a></div>
      </div>
    </div>
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>17</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup17" onclick="revealVideo('video17','youtube17')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/17.png" width="100%" height="auto" alt="Happy Holidays - Door 17" /></a></div>
      </div>
    </div>
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>18</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup18" onclick="revealVideo('video18','youtube18')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/18.png" width="100%" height="auto" alt="Happy Holidays - Door 18" /></a></div>
      </div>
    </div>
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>19</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup19" onclick="revealVideo('video19','youtube19')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/19.png" width="100%" height="auto" alt="Happy Holidays - Door 19" /></a></div>
      </div>
    </div>
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>20</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup20" onclick="revealVideo('video20','youtube20')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/20.png" width="100%" height="auto" alt="Happy Holidays - Door 20" /></a></div>
      </div>
    </div>
    
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>21</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup21" onclick="revealVideo('video21','youtube21')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/21.png" width="100%" height="auto" alt="Happy Holidays - Door 21" /></a></div>
      </div>
    </div>
    
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>22</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup22" onclick="revealVideo('video22','youtube22')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/22.png" width="100%" height="auto" alt="Happy Holidays - Door 22" /></a></div>
      </div>
    </div>
    
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>23</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup23" onclick="revealVideo('video23','youtube23')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/23.png" width="100%" height="auto" alt="Happy Holidays - Door 23" /></a></div>
      </div>
    </div>
    
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>24</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup24" onclick="revealVideo('video24','youtube24')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/24.png" width="100%" height="auto" alt="Happy Holidays - Door 24" /></a></div>
      </div>
    </div>
    
     <div class="day" onclick="void(0)">
      <div class="door">
        <h2>25</h2>
      </div>
      <div class="present">
        <div class="bauble"><a href="#popup25" onclick="revealVideo('video25','youtube25')"> <img src="https://netvu.informz.net/netvu/data/images/Christmas%202017/25.png" width="100%" height="auto" alt="Happy Holidays - Door 25" /></a></div>
      </div>
    </div>
     <div id="container">
  <!--Pup and tail -->
       <img id="pup" class="jingle-sound" src="https://netvu.informz.net/netvu/data/images/Christmas%202017/pup.png" alt="little pup"/><img id="tail" class="wag" src="https://netvu.informz.net/netvu/data/images/Christmas%202017/tail.png" alt="little pup tail"/>
    <!-- Boy -->
    <div="container"> <img id="boy" class="wave" src="https://netvu.informz.net/netvu/data/images/Christmas%202017/boy.png" alt="little boy"/><img id="arm" class="wave" src="https://netvu.informz.net/netvu/data/images/Christmas%202017/arm.png" alt="little boy"/>
    </div>
    </div>
  </main>
</div>
!

CSS

            
              /*Background scenery */

html{
  height: 100vh;
  background: #283044 url('https://netvu.informz.net/netvu/data/images/Christmas%202017/background.png') repeat-x;
  background-position: 1% 500px; 
  
}

/* Snow Animation - Credit: https://codepen.io/NickyCDK*/
#snow{
	background: none;
	font-family: Androgyne;
	background-image: url('https://netvu.informz.net/netvu/data/images/Christmas%202017/snow/s3.png'); 
  /*url('https://netvu.informz.net/netvu/data/images/Christmas%202017/snow/s2.png'), url('https://netvu.informz.net/netvu/data/images/Christmas%202017/snow/s3.png');*/
	height: 100%;
	left: 0;
	position: absolute;
	top: 0;
	width: 100%;
  min-height:900px;
  height:1200px;
	z-index:1;
	-webkit-animation: snow 10s linear infinite;
	-moz-animation: snow 10s linear infinite;
	-ms-animation: snow 10s linear infinite;
	animation: snow 10s linear infinite;
}
@keyframes snow {
  0% {background-position: 0px 0px, 0px 0px, 0px 0px;}
  50% {background-position: 500px 500px, 100px 200px, -100px 150px;}
  100% {background-position: 500px 1000px, 200px 400px, -100px 300px;}
}
@-moz-keyframes snow {
  0% {background-position: 0px 0px, 0px 0px, 0px 0px;}
  50% {background-position: 500px 500px, 100px 200px, -100px 150px;}
  100% {background-position: 400px 1000px, 200px 400px, 100px 300px;}
}
@-webkit-keyframes snow {
  0% {background-position: 0px 0px, 0px 0px, 0px 0px;}
  50% {background-position: 500px 500px, 100px 200px, -100px 150px;}
  100% {background-position: 500px 1000px, 200px 400px, -100px 300px;}
}
@-ms-keyframes snow {
  0% {background-position: 0px 0px, 0px 0px, 0px 0px;}
  50% {background-position: 500px 500px, 100px 200px, -100px 150px;}
  100% {background-position: 500px 1000px, 200px 400px, -100px 300px;}
}	

/*Happy Holidays title and text box at top of the page */
.box {
  width: 50%;
  margin: 0 auto;
  padding: 3px;
  background-clip: padding-box;
  text-align: center;
  color:#fff;
  font-family:Helvetica, Arial, sans-serif;
  line-height:1.8em;
  font-size:.9em;
}

/* Holiday Card */
h2.from-line{
  height:100px;
  margin-top:0px;
  margin-bottom:0px;
  font-size:13px;
  padding-bottom:0px;
/*text-transform:Uppercase;*/
}
.banner-text{
  height:50px;
  margin-top:0px;
  padding-top:0px;
  margin-bottom:40px;
  padding-bottom:10px;
  font-size:20px;
  font-weight:100;
  line-height:29px;
}
/* Container for scaling browser sizes */
.container {
  position: relative;
  float:left;
  max-width: 100vh;
  max-height: 50%;
  overflow: hidden;
  &:before {
    content: "";
    display: block;
    margin-top: 100vh;
  }
}
/* Boy */
#boy{
		position:absolute;
  	z-index:-1;
		left:45px;
		top:905px;
	}
	
	#arm{
		position:absolute;
		z-index:-2;
		left:0px;
		top:1020px;
animation:wave 4s infinite;
-webkit-animation:wave 4s infinite;}

#pup{
		position:absolute;
		z-index:1;
		left:294px;
		top:1078px;
	}

	
	#tail{
		position:absolute;
		z-index:-1;
		left:305px;
		top:1095px;
  animation:wag 2s infinite;
-webkit-animation:wag 2s infinite;
/*animation:wag 4s infinite;
webkit-animation:wag 4s infinite;}*/
	}


/*Hand Animation*/
@-webkit-keyframes wave{
	0%  {-webkit-transform:rotate(-5deg)}
	50% {-webkit-transform:rotate(15deg)}
	100%{-webkit-transform:rotate(-5deg)}
}
@keyframes wave{
	0%  {transform:rotate(-5deg);-ms-transform:rotate(-5deg)}
	50% {transform:rotate(15deg);-ms-transform:rotate(15deg)}
	100%{transform:rotate(-5deg);-ms-transform:rotate(-5deg)}
}

/*wag Animation*/
@-webkit-keyframes wag{
	0%  {-webkit-transform:rotate(0deg)}
	50% {-webkit-transform:rotate(15deg)}
	100%{-webkit-transform:rotate(0deg)}
}
@keyframes wag{
	0%  {transform:rotate(0deg);-ms-transform:rotate(0deg)}
	50% {transform:rotate(15deg);-ms-transform:rotate(15deg)}
	100%{transform:rotate(0deg);-ms-transform:rotate(0deg)}
}
/* Inside Popup */

/* Header iCon*/
img.header-icon{
  width:65px;
  height:auto;
  padding:15px;
 display: block;
    margin-left: auto;
    margin-right: auto;
}

/* Advent Doors */
main {
    text-align: center;
 padding:20px 10px 10px 20px;
  
  }

  .door,
  .present {
    width: 100%;
    height: 100%;
  }

  .day {
    display: inline-block;
    width: 9em;
    height: 9em;
    margin: 5px;
    -webkit-perspective: 850px;
            perspective: 850px;
    z-index:1;
  }

  .door {
    position: relative;
    background: #92d050;
    -webkit-transform-style: preserve-3d;
            transform-style: preserve-3d;
    -webkit-transform-origin: 0;
            transform-origin: 0;
    -webkit-perspective: 850px;
            perspective: 850px;
    text-align: center;
    box-shadow: 0 0 40px 0 rgba(0, 0, 0, 0.15);
    cursor: pointer;
    -webkit-transition: all 0.3s ease-out;
    transition: all 0.3s ease-out;
    z-index:2000;
  }
  .door h2 {
    position: absolute;
    width: 3em;
    height: 3em;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
            transform: translate(-50%, -50%);
    margin: 0;
    padding: 0.5em;
    font-size: 2em;
    line-height: 3em;
    color: white;
    border-radius: 50%;
  }

  .day:hover .door,
  .day:focus .door,
  .day:active .door {
    background: #92d050;
    -webkit-transform: rotateY(-97deg);
            transform: rotateY(-97deg);
    -webkit-perspective-origin: 0;
            perspective-origin: 0;
    -webkit-transition: all .4s ease-in;
    transition: all .4s ease-in;
  }
  .day:hover .door h2,
  .day:focus .door h2,
  .day:active .door h2 {

    -webkit-backface-visibility: hidden;
            backface-visibility: hidden;
  }
  .day:hover .bauble,
  .day:focus .bauble,
  .day:active .bauble {
    display: inline-block;
    -webkit-animation: shake 1s;
            animation: shake 1s;
    -webkit-transform-origin: 50% 0;
            transform-origin: 50% 0;
  }

  .present1 {
        background-image: url('https://netvu.informz.net/netvu/data/images/Christmas%202017/11.png');
    position: absolute;
    top: 0;
    left: 0;
  /*  background: #221;*/
    /* background: url('https://netvu.informz.net/netvu/data/images/Christmas%202017/11.png');*/
    box-shadow: 0 0 40px 0 rgba(0, 0, 0, 0.15), inset 0 0 30px 20px rgba(0, 0, 0, 0.4);
    z-index: -1;
  }
.present {
  background:#fff;
      /*  background-image: url('https://netvu.informz.net/netvu/data/images/Christmas%202017/11.png');*/
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
    box-shadow: 0 0 40px 0 rgba(0, 0, 0, 0.15), inset 0 0 30px 20px rgba(0, 0, 0, 0.1);
}

  .bauble {
    margin-top:20px;
    position: relative;
    width: 100px;
    height: 110px;
  }


  @keyframes shake {
    0% {
      -webkit-transform: rotate(0deg);
              transform: rotate(0deg);
    }
    20% {
      -webkit-transform: rotate(-20deg);
              transform: rotate(-20deg);
    }
    40% {
      -webkit-transform: rotate(20deg);
              transform: rotate(20deg);
    }
    60% {
      -webkit-transform: rotate(-10deg);
              transform: rotate(-10deg);
    }
    80% {
      -webkit-transform: rotate(10deg);
              transform: rotate(10deg);
    }
    100% {
      -webkit-transform: rotate(0deg);
              transform: rotate(0deg);
    }
  }
  @-webkit-keyframes shake {
    0% {
      -webkit-transform: rotate(0deg);
              transform: rotate(0deg);
    }
    20% {
      -webkit-transform: rotate(-20deg);
              transform: rotate(-20deg);
    }
    40% {
      -webkit-transform: rotate(20deg);
              transform: rotate(20deg);
    }
    60% {
      -webkit-transform: rotate(-10deg);
              transform: rotate(-10deg);
    }
    80% {
      -webkit-transform: rotate(10deg);
              transform: rotate(10deg);
    }
    100% {
      -webkit-transform: rotate(0deg);
              transform: rotate(0deg);
    }
  }
@media only screen and (min-width: 1200px) {
    /* styles for wide screens */
}
@media only screen and (max-width: 830px) {
    /* styles for wide screens */
    #boy,#pup,#pup2,#arm,#tail{z-index:-1;
  }
}

@media only screen and (max-width: 580px) {
  html{
    background-position:bottom 100%;
    margin-top:220vh;
  }
  #boy,#pup,#pup2,#arm,#tail{z-index:-1;
  }
    #container{
      position:relative;
    height:auto;
  }
  .demo-holder{width:70%;
  margin:0px auto;}
}

/*Lightbox */
.lightbox {
  background-color: fade(black, 80%);  
  overflow: scroll;
  position: fixed;
  display: none;
  z-index: 1;
  bottom: 0;
  right: 0;
  left: 0;
  top: 0;
  z-index:2;
  &-container {
    position: relative;
    max-width: 960px;
    margin: 7% auto;
    display: block;    
    padding: 0 3%;
    height: auto;
    z-index: 10;
    
    // Increasing top margin for mobile
    @media screen and (max-width: 768px) { margin-top: 10%; }
    @media screen and (max-width: 414px) { margin-top: 13%; }
  }
    
  &-content {
    box-shadow: 0 1px 6px fade(black, 70%);
  }
  
  &-close {
    text-transform: uppercase;    
    background: transparent;
    position: absolute; 
    font-weight: 300;      
    font-size: 12px;
    display: block;
    border: none;
    color: white;
    top: -22px;
    right: 3%;
  }
}

.video-container {  
    padding-bottom: 56.25%;
    position: relative;  
    padding-top: 30px; 
    overflow: hidden;
    height: 0; 
}

.video-container iframe,
.video-container object,
.video-container embed {
    position: absolute;
    height: 100%;  
    width: 100%;  
    left: 0;  
    top: 0;
}
!

JS

            
              // Function to reveal lightbox and adding YouTube autoplay
function revealVideo(div,video_id) {
  var video = document.getElementById(video_id).src;
  //document.getElementById(video_id).src = video+'&autoplay=1'; // adding autoplay to the URL
  document.getElementById(div).style.display = 'block';
}

// Hiding the lightbox and removing YouTube autoplay
function hideVideo(div,video_id) {
  var video = document.getElementById(video_id).src;
  var cleaned = //video.replace('&autoplay=1',''); // removing autoplay form url
  document.getElementById(video_id).src = cleaned;
  document.getElementById(div).style.display = 'none';
}
!
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