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HTML

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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>

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CSS

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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

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="blocks">
  <input id="left-top" type="checkbox" name="left-top"/>
  <label for="left-top" class="trigger left top"></label>
  <div class="block left top">
    <h1>Left top block heading</h1>
    <div class="content"> 
      <h2>Left top block inner text heading</h2>
      <p>LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH </p> 
      <p>LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH</p>
      <p>LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH</p>  
    </div> 
  </div> 
  <input id="right-top" type="checkbox" name="right-top"/>
  <label for="right-top" class="trigger right top"></label>
  <div class="block right top">
    <h1>Right top block heading</h1>
    <div class="content"> 
      <h2>Right top block inner text heading</h2>
      <p>LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH </p>
      <p>LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH</p>
      <p>LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH</p>
    </div>
  </div>
  <input id="left-bot" type="checkbox" name="left-bot"/>
  <label for="left-bot" class="trigger left bot"></label>
  <div class="block left bot">
    <h1>Left bottom block heading</h1>
    <div class="content">
      <h2>Left bottom inner text heading</h2>
      <p>LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH </p>
      <p>LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH</p>
      <p>LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH</p>
    </div>
  </div>
  <input id="right-bot" type="checkbox" name="right-bot"/>
  <label for="right-bot" class="trigger right bot"></label>
  <div class="block right bot">
    <h1>Right bottom block heading</h1>
    <div class="content">
      <h2>Right bottom inner text heading</h2>
      <p>LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH </p>
      <p>LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH</p>
      <p>LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH LOREM IPSUM AND YOU KNOW THE REST BLAH BLAH BLAH</p>
    </div>
  </div>
</div>
!

CSS 

              
                @import "compass/css3";

*, *:before, *:after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
a {
  color: inherit;
  text-decoration: none;
}
html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
}
input[type=checkbox] {
  position: absolute;
  left: -9999px;
  top: -9999px;
}

/* SASS BASE CLASSES */
.absPos {
  position: absolute; 
  width: 50%;
  height: 50%;
  
  &.top {
    top: 0;
  }
  &.right {
    left: 50%;
  }
  &.bot {
    top: 50%;
  }
  &.left {
    left: 0;
  }
}
.labelClose {
  left: auto;
  bottom: auto;
  right: 0;
  top: 0;
  width: 30px;
  height: 30px;
  z-index: 101;
  animation: hideAndShow 1s;
  
  &:before {
    content: "+";
    display: block;
    position: absolute;
    top: 5px;
    right: 43px;
    font-size: 50px;
    line-height: 30px;
    font-weight: bold;
    color: #fff;
    transform: rotate(45deg);
    transition: 0.5s;
  }
  
  &:hover:before {
    transform: rotate(225deg);
    color: red;
  }
}
.activeBlock {
  transform: translateZ(0) scale(2.005);
  z-index: 100;
  overflow-x: hidden;
  overflow-y: auto;

  h1 {
    opacity: 0;
    z-index: 5;
  }
  .content {
    opacity: 1;
    z-index: 150;
  }
}
/* END OF SASS BASE CLASSES */

.blocks {
  width: 100%;
  height: 100%;
  position: relative;
  text-align: center;
  
  .trigger {
    @extend .absPos;
    z-index: 30;
    //transition: 0.5s;
    cursor: pointer;
    
    &:hover + .block h1 {
      color: #fff;
    }
  }
  .block {
    @extend .absPos;
    font-size: 14px;
    transition: 0.5s;
    will-change: transform;
    //transform-style: preserve-3d;
    z-index: 5;
    background-size: cover;
    
    &.left.top {
      //background: #f5bfb8;
      transform-origin: 0% 0%;
      background-image: url('https://2.bp.blogspot.com/_F91XpngCLn8/S-cdscZPSZI/AAAAAAAAADE/5vL-lYz1Wws/s1600/watchmen_by_imladriselleth.jpg');
    }
    &.right.top {
      //background: #c8f4f2;
      transform-origin: 100% 0%;
      background-image: url('http://images5.alphacoders.com/401/401566.jpg');
    }
    &.left.bot {
      //background: #c8f4c8;
      transform-origin: 0% 100%;
      background-image: url('http://images6.alphacoders.com/332/332890.jpg');
    }
    &.right.bot {
      //background: #eef4c8;
      transform-origin: 100% 100%;
      background-image: url('https://i.imgur.com/fXp6r5l.jpg');
    }
    
    h1 {
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translateX(-50%) translateY(-50%);
      text-transform: uppercase;
      color: #aaa;
      transition: 0.5s;
      will-change: opacity;
    }
    
    .content {
      opacity: 0;
      z-index: 1;
      padding: 2em;
      text-align: left;
      transition: 0.5s;
      color: #fff;
      background-color: rgba(0, 0, 0, 0.6);
      will-change: opacity;
      //transition-delay: 0.5s;
      
      h2 {
        font-size: 2.5em;
        margin-bottom: 1em;
      }
      p {
        font-size: 1em;
        margin: 0.5em 0;
      }
    }
  }
  
  #left-top:checked ~ .block.left.top {
    @extend .activeBlock;
  }
  #left-top:checked ~ .trigger.left.top {
    @extend .labelClose;
  }
  #right-top:checked ~ .block.right.top {
    @extend .activeBlock;
  }
  #right-top:checked ~ .trigger.right.top {
    @extend .labelClose;
  }
  #left-bot:checked ~ .block.left.bot {
    @extend .activeBlock;
  }
  #left-bot:checked ~ .trigger.left.bot {
    @extend .labelClose;
  }
  #right-bot:checked ~ .block.right.bot {
    @extend .activeBlock;
  }
  #right-bot:checked ~ .trigger.right.bot {
    @extend .labelClose;
  }
}
/* fix for position absolute label movement outside block */
@keyframes hideAndShow {
  0% {
    opacity: 0;
  }
  50% {
    opacity: 0;
    transform: scale(0.5);
  }
  90% {
    transform: scale(1.2);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}
!

JS
!
999px

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