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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.

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CSS

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CSS Base

About CSS Base

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HTML 

              
                
<canvas id="sky"></canvas> 

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 800 600" class="constellation">
  <circle id="star2" cx="100.4" cy="150.4" r="1.8" style="fill: #FADFAA; opacity: 0" />
</svg>

<svg xmlns="http://www.w3.org/2000/svg" id="horse" viewBox="0 0 800 600">
  <circle class="dots" style="fill: #FADFAA;" cx="51" cy="203" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="159" cy="181" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="268" cy="180" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="359" cy="131" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="409" cy="93" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="378" cy="100" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="430" cy="119" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="465" cy="153" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="357" cy="247" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="417" cy="264" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="450" cy="303" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="460" cy="327" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="367" cy="368" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="355" cy="367" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="345" cy="326" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="332" cy="269" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="200" cy="251" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="144" cy="259" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="99" cy="309" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="92" cy="363" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="15" cy="339" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="24" cy="348" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="43" cy="341" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="76" cy="297" r="2.2" /><circle class="dots" style="fill: #FADFAA;" cx="110" cy="266" r="2.2" />
</svg>

<svg xmlns="http://www.w3.org/2000/svg" id="horse2" viewBox="0 0 800 600">
 
<circle id="c0" class="dots" style="fill: #FADFAA;" cx="16" cy="343" r="2.2" /><circle id="c1" class="dots" style="fill: #FADFAA;" cx="44" cy="343" r="2.2" /><circle id="c2" class="dots" style="fill: #FADFAA;" cx="74" cy="296" r="2.2" /><circle id="c3" class="dots" style="fill: #FADFAA;" cx="100" cy="369" r="2.2" /><circle id="c4" class="dots" style="fill: #FADFAA;" cx="88" cy="362" r="2.2" /><circle id="c5" class="dots" style="fill: #FADFAA;" cx="95" cy="311" r="2.2" /><circle id="c6" class="dots" style="fill: #FADFAA;" cx="146" cy="253" r="2.2" /><circle id="c7" class="dots" style="fill: #FADFAA;" cx="48" cy="205" r="2.2" /><circle id="c8" class="dots" style="fill: #FADFAA;" cx="172" cy="173" r="2.2" /><circle id="c9" class="dots" style="fill: #FADFAA;" cx="315" cy="170" r="2.2" /><circle id="c10" class="dots" style="fill: #FADFAA;" cx="425" cy="112" r="2.2" /><circle id="c11" class="dots" style="fill: #FADFAA;" cx="461" cy="168" r="2.2" /><circle id="c12" class="dots" style="fill: #FADFAA;" cx="464" cy="136" r="2.2" /><circle id="c13" class="dots" style="fill: #FADFAA;" cx="379" cy="96" r="2.2" /><circle id="c14" class="dots" style="fill: #FADFAA;" cx="355" cy="250" r="2.2" /><circle id="c15" class="dots" style="fill: #FADFAA;" cx="420" cy="268" r="2.2" /><circle id="c16" class="dots" style="fill: #FADFAA;" cx="449" cy="298" r="2.2" /><circle id="c17" class="dots" style="fill: #FADFAA;" cx="459" cy="327" r="2.2" /><circle id="c18" class="dots" style="fill: #FADFAA;" cx="374" cy="370" r="2.2" /><circle id="c19" class="dots" style="fill: #FADFAA;" cx="356" cy="365" r="2.2" /><circle id="c20" class="dots" style="fill: #FADFAA;" cx="343" cy="321" r="2.2" />
  
</svg>
!

CSS 

              
                html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

#sky {
  background: -webkit-linear-gradient(#00111e 30%, #033d5e);
  background: -moz-linear-gradient(#00111e 30%, #033d5e);
  background: -o-linear-gradient(#00111e 30%, #033d5e);
  background: linear-gradient(#00111e 30%, #033d5e);
  overflow: hidden;
}

.constellation {
    width: 100%;
    height: 100%;
    margin-right: 0px;
    font: 1em source-sans-pro, Source Sans Pro, Helvetica, sans-serif;
    position: absolute;
    left: 0px;
    top: 0px;
    z-index: 1000;
}

#star2 {
  fill: #FADFAA;
}

#horse {
  width: 100%;
    height: 100%;
    margin-right: 0px;
    font: 1em source-sans-pro, Source Sans Pro, Helvetica, sans-serif;
    position: absolute;
    left: 0px;
    top: 0px;
    z-index: 1000;
  display:none;
}

#horse2 {
  width: 100%;
    height: 100%;
    margin-right: 0px;
    font: 1em source-sans-pro, Source Sans Pro, Helvetica, sans-serif;
    position: absolute;
    left: 0px;
    top: 0px;
    z-index: 1000;
}
!

JS 

              
                function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}
 
// Line up some sky vars
var c = document.getElementById('sky');
var ctx = c.getContext('2d');
var xMax = c.width = window.screen.availWidth;
var yMax = c.height = window.screen.availHeight;
var hmTimes = Math.round(xMax + yMax);	

var star2 = document.getElementById("star2");
 
var tl = new TimelineLite();

for(var i=0; i<=hmTimes; i++) {
  var x = getRandomInt(300,xMax/4);
  var y = getRandomInt(-100,yMax/4);
  var r = Math.floor((Math.random()*2)+1);//getRandomInt(0.5,2);
  tl.to(star2, Math.random(), {x:x,y:y,r:r,delay:Math.random()})
    .to(star2, 1, {x:y,y:x,autoAlpha:1})
    .to(star2, .5, {autoAlpha:0},"-=0.5");
}

function drawing() {
	for(var i=0; i<=hmTimes; i++) {
	  var randomX = Math.floor((Math.random()*xMax)+1);
	  var randomY = Math.floor((Math.random()*yMax)+1);
	  var randomSize = Math.floor((Math.random()*2)+1);
	  var randomOpacityOne = Math.floor((Math.random()*9)+1);
	  var randomOpacityTwo = Math.floor((Math.random()*9)+1);
	  var randomHue = Math.floor((Math.random()*360)+1);
    if(randomSize>1) {
      ctx.shadowBlur = Math.floor((Math.random()*15)+5);
      ctx.shadowColor = "white";
	  }
    ctx.fillStyle = "hsla("+randomHue+", 30%, 80%, ."+randomOpacityOne+randomOpacityTwo+")";
	  ctx.fillRect(randomX, randomY, randomSize, randomSize);
	}
}

drawing();
 
var c0 = $("#c0");
var c1 = $("#c1");
var c2 = $("#c2");
var c3 = $("#c3");
var c4 = $("#c4");
var c5 = $("#c5");
var c6 = $("#c6");
var c7 = $("#c7");
var c8 = $("#c8");
var c9 = $("#c9");
var c10 = $("#c10");
var c11 = $("#c11");
var c12 = $("#c12");
var c13 = $("#c13");
var c14 = $("#c14");
var c15 = $("#c15");
var c16 = $("#c16");
var c17 = $("#c17");
var c18 = $("#c18");
var c19 = $("#c19");
var c20 = $("#c20");

var t1 = new TimelineMax({
  onReverseComplete:reverseRepeat,
  onReverseCompleteParams:['{self}'],
  onComplete:complete,
  onCompleteParams:['{self}']
}); 

function reverseRepeat(tl) {
  tl.reverse(0); // 0 sets the playhead at the end of the animation
}


function complete(tl) {
  tl.restart(); // 0 sets the playhead at the end of the animation
}

t1.to(c7, 0.5, {attr:{cx:55, cy:211}}, "frame1")
.to(c8, 0.5, {attr:{cx:186, cy:177}}, "frame1")
.to(c2, 0.5, {attr:{cx:81, cy:284}}, "frame1")
.to(c1, 0.5, {attr:{cx:45, cy:333}}, "frame1")
.to(c0, 0.5, {attr:{cx:20, cy:331}}, "frame1")
.to(c5, 0.5, {attr:{cx:102, cy:290}}, "frame1")
.to(c6, 0.5, {attr:{cx:159, cy:256}}, "frame1")
.to(c4, 0.5, {attr:{cx:64, cy:358}}, "frame1")
.to(c3, 0.5, {attr:{cx:66, cy:372}}, "frame1")
.to(c20, 0.5, {attr:{cx:313, cy:322}}, "frame1")
.to(c19, 0.5, {attr:{cx:308, cy:364}}, "frame1")
.to(c14, 0.5, {attr:{cx:356, cy:261}}, "frame1")
.to(c17, 0.5, {attr:{cx:464, cy:339}}, "frame1")
.to(c16, 0.5, {attr:{cx:446, cy:333}}, "frame1")
.to(c15, 0.5, {attr:{cx:408, cy:300}}, "frame1")
.to(c10, 0.5, {attr:{cx:434, cy:121}}, "frame1")
.to(c11, 0.5, {attr:{cx:466, cy:175}}, "frame1")
.to(c13, 0.5, {attr:{cx:387, cy:107}}, "frame1")
.to(c2, 0.5, {attr:{cx:92, cy:265}}, "frame2")
.to(c1, 0.5, {attr:{cx:70, cy:318}}, "frame2")
.to(c0, 0.5, {attr:{cx:42, cy:324}}, "frame2")
.to(c7, 0.5, {attr:{cx:65, cy:209}}, "frame2")
.to(c8, 0.5, {attr:{cx:186, cy:170}}, "frame2")
.to(c13, 0.5, {attr:{cx:395, cy:101}}, "frame2")
.to(c10, 0.5, {attr:{cx:432, cy:122}}, "frame2")
.to(c11, 0.5, {attr:{cx:462, cy:178}}, "frame2")
.to(c12, 0.5, {attr:{cx:466, cy:146}}, "frame2")
.to(c14, 0.5, {attr:{cx:354, cy:261}}, "frame2")
.to(c15, 0.5, {attr:{cx:391, cy:322}}, "frame2")
.to(c16, 0.5, {attr:{cx:416, cy:361}}, "frame2")
.to(c19, 0.5, {attr:{cx:262, cy:356}}, "frame2")
.to(c18, 0.5, {attr:{cx:273, cy:371}}, "frame2")
.to(c20, 0.5, {attr:{cx:284, cy:316}}, "frame2")
.to(c6, 0.5, {attr:{cx:169, cy:262}}, "frame2")
.to(c5, 0.5, {attr:{cx:109, cy:276}}, "frame2")
.to(c4, 0.5, {attr:{cx:63, cy:344}}, "frame2")
.to(c3, 0.5, {attr:{cx:38, cy:347}}, "frame2")
.to(c7, 0.5, {attr:{cx:76, cy:216}}, "frame3")
.to(c10, 0.5, {attr:{cx:426, cy:131}}, "frame3")
.to(c12, 0.5, {attr:{cx:464, cy:152}}, "frame3")
.to(c11, 0.5, {attr:{cx:464, cy:184}}, "frame3")
.to(c14, 0.5, {attr:{cx:340, cy:263}}, "frame3")
.to(c15, 0.5, {attr:{cx:339, cy:330}}, "frame3")
.to(c16, 0.5, {attr:{cx:348, cy:367}}, "frame3")
.to(c19, 0.5, {attr:{cx:251, cy:357}}, "frame3")
.to(c18, 0.5, {attr:{cx:225, cy:369}}, "frame3")
.to(c20, 0.5, {attr:{cx:292, cy:320}}, "frame3")
.to(c2, 0.5, {attr:{cx:111, cy:261}}, "frame3")
.to(c0, 0.5, {attr:{cx:115, cy:321}}, "frame3")
.to(c3, 0.5, {attr:{cx:93, cy:332}}, "frame3")
.to(c1, 0.5, {attr:{cx:75, cy:331}}, "frame3")
.to(c4, 0.5, {attr:{cx:55, cy:327}}, "frame3")
.to(c6, 0.5, {attr:{cx:190, cy:256}}, "frame4")
.to(c2, 0.5, {attr:{cx:129, cy:272}}, "frame4")
.to(c0, 0.5, {attr:{cx:160, cy:326}}, "frame4")
.to(c3, 0.5, {attr:{cx:150, cy:345}}, "frame4")
.to(c1, 0.5, {attr:{cx:111, cy:322}}, "frame4")
.to(c4, 0.5, {attr:{cx:88, cy:337}}, "frame4")
.to(c5, 0.5, {attr:{cx:110, cy:256}}, "frame4")
.to(c7, 0.5, {attr:{cx:73, cy:226}}, "frame4")
.to(c14, 0.5, {attr:{cx:321, cy:271}}, "frame4")
.to(c15, 0.5, {attr:{cx:303, cy:331}}, "frame4")
.to(c16, 0.5, {attr:{cx:294, cy:368}}, "frame4")
.to(c20, 0.5, {attr:{cx:310, cy:338}}, "frame4")
.to(c19, 0.5, {attr:{cx:265, cy:348}}, "frame4")
.to(c18, 0.5, {attr:{cx:239, cy:342}}, "frame4")
.to(c13, 0.5, {attr:{cx:385, cy:105}}, "frame4")
.to(c10, 0.5, {attr:{cx:420, cy:136}}, "frame4")
.to(c11, 0.5, {attr:{cx:461, cy:184}}, "frame4")
.to(c12, 0.5, {attr:{cx:464, cy:154}}, "frame4")
.to(c9, 0.5, {attr:{cx:320, cy:169}}, "frame4")
.to(c7, 0.5, {attr:{cx:79, cy:232}}, "frame5")
.to(c2, 0.5, {attr:{cx:161, cy:293}}, "frame5")
.to(c0, 0.5, {attr:{cx:204, cy:330}}, "frame5")
.to(c3, 0.5, {attr:{cx:204, cy:354}}, "frame5")
.to(c1, 0.5, {attr:{cx:153, cy:319}}, "frame5")
.to(c4, 0.5, {attr:{cx:140, cy:338}}, "frame5")
.to(c5, 0.5, {attr:{cx:129, cy:266}}, "frame5").to(c6, 0.5, {attr:{cx:194, cy:250}}, "frame5").to(c20, 0.5, {attr:{cx:341, cy:331}}, "frame5").to(c19, 0.5, {attr:{cx:298, cy:341}}, "frame5").to(c18, 0.5, {attr:{cx:273, cy:329}}, "frame5").to(c15, 0.5, {attr:{cx:291, cy:321}}, "frame5").to(c16, 0.5, {attr:{cx:255, cy:364}}, "frame5").to(c12, 0.5, {attr:{cx:457, cy:162}}, "frame6").to(c11, 0.5, {attr:{cx:449, cy:183}}, "frame6").to(c13, 0.5, {attr:{cx:378, cy:106}}, "frame6").to(c10, 0.5, {attr:{cx:412, cy:138}}, "frame6").to(c8, 0.5, {attr:{cx:192, cy:172}}, "frame6").to(c20, 0.5, {attr:{cx:374, cy:308}}, "frame6").to(c19, 0.5, {attr:{cx:345, cy:335}}, "frame6").to(c18, 0.5, {attr:{cx:319, cy:325}}, "frame6").to(c15, 0.5, {attr:{cx:308, cy:342}}, "frame6").to(c16, 0.5, {attr:{cx:261, cy:360}}, "frame6").to(c0, 0.5, {attr:{cx:236, cy:339}}, "frame6").to(c3, 0.5, {attr:{cx:246, cy:360}}, "frame6").to(c2, 0.5, {attr:{cx:197, cy:313}}, "frame6").to(c5, 0.5, {attr:{cx:153, cy:286}}, "frame6").to(c1, 0.5, {attr:{cx:201, cy:326}}, "frame6").to(c4, 0.5, {attr:{cx:196, cy:347}}, "frame6").to(c15, 0.5, {attr:{cx:340, cy:324}}, "frame7").to(c16, 0.5, {attr:{cx:297, cy:337}}, "frame7").to(c20, 0.5, {attr:{cx:392, cy:286}}, "frame7").to(c15, 0.5, {attr:{cx:386, cy:322}}, "frame7").to(c18, 0.5, {attr:{cx:364, cy:337}}, "frame7").to(c5, 0.5, {attr:{cx:184, cy:302}}, "frame7").to(c0, 0.5, {attr:{cx:237, cy:324}}, "frame7").to(c3, 0.5, {attr:{cx:243, cy:343}}, "frame7").to(c4, 0.5, {attr:{cx:270, cy:372}}, "frame7").to(c1, 0.5, {attr:{cx:209, cy:327}}, "frame7").to(c2, 0.5, {attr:{cx:212, cy:285}}, "frame7").to(c8, 0.5, {attr:{cx:193, cy:180}}, "frame7").to(c7, 0.5, {attr:{cx:71, cy:230}}, "frame7").to(c20, 0.5, {attr:{cx:402, cy:278}}, "frame8").to(c15, 0.5, {attr:{cx:412, cy:321}}, "frame8").to(c18, 0.5, {attr:{cx:408, cy:341}}, "frame8").to(c19, 0.5, {attr:{cx:371, cy:314}}, "frame8").to(c16, 0.5, {attr:{cx:337, cy:332}}, "frame8").to(c13, 0.5, {attr:{cx:377, cy:117}}, "frame8").to(c10, 0.5, {attr:{cx:415, cy:138}}, "frame8").to(c11, 0.5, {attr:{cx:444, cy:188}}, "frame8").to(c12, 0.5, {attr:{cx:458, cy:170}}, "frame8").to(c7, 0.5, {attr:{cx:57, cy:214}}, "frame8").to(c0, 0.5, {attr:{cx:263, cy:334}}, "frame8").to(c3, 0.5, {attr:{cx:279, cy:353}}, "frame8").to(c5, 0.5, {attr:{cx:207, cy:307}}, "frame8").to(c2, 0.5, {attr:{cx:183, cy:327}}, "frame8").to(c1, 0.5, {attr:{cx:208, cy:369}}, "frame8");

t1.timeScale(4);
!
999px

Console