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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

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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-.

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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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Packages

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Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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HTML 

              
                <div id="lamp">
  <div id="top"></div>
  <div id="glass">
  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
  <div class="bubble"></div>
  </div>
  <div id="bottom"></div>
</div>
!

CSS 

              
                @keyframes updown {
    0%   {top: 110%;}
  50%  {top: 0;}
   100%  {top: 110%;}
}

@keyframes leftright {
    0%   {left: 0;}
  50%  {left: 80%;}
   100%  {left: 0;}
}

@keyframes vastag {
    0%   {width: 8vh;}
  50%  {width: 32vh;}
   100%  {width: 8vh;}
}

@keyframes forog {
  100% {transform: rotate(360deg);}
}


body {
  background: radial-gradient(#500, #000);
  margin: 0;
}
body::after {
  content: ' ';
  display: block;
  position: absolute;
  background: linear-gradient(rgba(255,255,255,.6), rgba(128,128,255,.3));
  width: 4vh;
  height: 70vh;
  margin-left: -17vh;
  left: 50%;
  bottom: 20vh;
  z-index: 2;
  border-radius: 1vh 1vh 2vh 2vh;
  filter: blur(.5vh);
  transform: skewX(-2deg);
}

#lamp {
  width: 40vh;
  height: 100vh;
  margin: 0 auto;
}
#top, #bottom {
  background: #888;
  background: linear-gradient(111deg, #111 0%, #ccc 45%, #ccc 50%, #888 60%, #111);
}
#top {
  height: 7vh;
  width: 36vh;
  position: relative;
  top: .5vh;
  left: 2vh;
  border-radius: 12vh 12vh 1vh 1vh/66% 66% 2vh 2vh;
  box-shadow:
    0 4vh 16vh 16vh rgba(0,0,0,.5),
    0 1vh 4vh 4vh rgba(0,0,0,.3),
    inset 0 .5vh .5vh rgba(255,255,255,.5),
    inset 0 -.3vh .5vh rgba(128,0,0,.5);
  z-index: 2;
}
#top::after {
  content: ' ';
  display: block;
  position: absolute;
  background: #fff;
  width: 30vh;
  height: 3vh;
  margin-left: -15vh;
  left: 50%;
  bottom: 4vh;
  z-index: 2;
  border-radius: 48%;
  filter: blur(2vh);
}
#bottom {
  height: 3vh;
  border-radius: 1vh;
  box-shadow: 
    inset 0 -.5vh .5vh rgba(0,0,0,.5),
    inset 0 .5vh .5vh rgba(128,0,0,.5);
}
#bottom::after {
  content: ' ';
  display: block;
  position: absolute;
  background: yellow;
  width: 30vh;
  height: 4vh;
  margin-left: -15vh;
  left: 50%;
  bottom: 5vh;
  z-index: 2;
  border-radius: 48%;
  filter: blur(3vh);
}
#glass {
  overflow: hidden;
  width: 100%;
  height: 90vh;
  position: relative;
  top: -4vh;
  transform: perspective(100vh) rotateX(12deg);
  filter: contrast(22);
  background: linear-gradient(blue 30%, #60a 80%, #a06 100%);
  box-shadow: inset 0 -5vh 1vh 1vh rgba(255,0,0,.6), 0 0 2.5px .2px #808;
  border-radius: 1vh 1vh 5vh 5vh/20%;
}
.bubble {
  height: 16vh;
  border-radius: 40%;
  background: red;
  position: absolute;
  filter: blur(4vh);
  animation: updown linear 37s infinite,
    leftright ease-in-out 23s infinite,
    vastag linear 29s infinite,
    forog linear 31s infinite;
}
.bubble:nth-child(2) {
  animation: updown ease-in 41s infinite,
    leftright ease-in-out 47s infinite,
    vastag linear 23s infinite,
    forog linear 29s infinite;
}
.bubble:nth-child(3) {
  animation: updown ease-out 43s infinite,
    leftright ease-in-out 53s infinite,
    vastag linear 29s infinite,
    forog linear 31s infinite;
}
.bubble:nth-child(4) {
  animation: updown ease-in-out 47s infinite,
    leftright ease-in-out 59s infinite,
    vastag linear 31s infinite,
    forog linear 41s infinite;
}
.bubble:nth-child(5) {
  animation: updown ease-in-out 29s infinite,
    leftright ease-in-out 31s infinite,
    vastag linear 37s infinite,
    forog linear 47s infinite;
}
.bubble:last-child {
  animation: updown linear 53s infinite,
    leftright ease-in-out 29s infinite,
    vastag linear 19s infinite,
    forog linear 37s infinite;
}
!

JS 

              
                // NOT!
!
999px

Console