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CSS

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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

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <ul>
  <li>
    <div class="detail">
      <div class="pic">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/53148/rachel.jpg" />
      </div>
      <div class="text"><span class="name">Rachel Green</span>Barton did feebly change man she afford square add. Want eyes by neat so just must.</div>
    </div>
    <div class="toolbar">
      <div class="fold-top"></div>
      <div class="fold-bottom"></div>
      <div class="icons">
        <span class="entypo-heart"></span>
        <span class="entypo-reply"></span>
        <span class="entypo-share"></span>
        <span class="entypo-star"></span>
        <span class="entypo-retweet"></span>
      </div>
    </div>  
  </li>
  <li>
    <div class="detail">
      <div class="pic">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/53148/joey.jpg" />
      </div>
      <div class="text"><span class="name">Joey Tribbiani</span>Abilities forfeited situation extremely my to he resembled. Old had conviction discretion understood put principles you. </div>
    </div>
    <div class="toolbar">
      <div class="fold-top"></div>
      <div class="fold-bottom"></div>
      <div class="icons">
        <span class="entypo-heart"></span>
        <span class="entypo-reply"></span>
        <span class="entypo-share"></span>
        <span class="entypo-star"></span>
        <span class="entypo-retweet"></span>
      </div>
    </div>  
  </li>
  <li>
    <div class="detail">
      <div class="pic">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/53148/manica.jpg" />
      </div>
      <div class="text"><span class="name">Monica Geller</span>Shot what able cold new the see hold. Friendly as an betrayed formerly he. Morning because as to society behaved moments. Put ladies design mrs sister was.  </div>
    </div>
    <div class="toolbar">
      <div class="fold-top"></div>
      <div class="fold-bottom"></div>
      <div class="icons">
        <span class="entypo-heart"></span>
        <span class="entypo-reply"></span>
        <span class="entypo-share"></span>
        <span class="entypo-star"></span>
        <span class="entypo-retweet"></span>
      </div>
    </div>  
  </li>
  <li>
    <div class="detail">
      <div class="pic">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/53148/phoebe.jpg" />
      </div>
      <div class="text"><span class="name">Phoebe Buffay</span>Enjoyed minutes related as at on on. Is fanny dried as often me. </div>
    </div>
    <div class="toolbar">
      <div class="fold-top"></div>
      <div class="fold-bottom"></div>
      <div class="icons">
        <span class="entypo-heart"></span>
        <span class="entypo-reply"></span>
        <span class="entypo-share"></span>
        <span class="entypo-star"></span>
        <span class="entypo-retweet"></span>
      </div>
    </div>  
  </li>
  <li>
    <div class="detail">
      <div class="pic">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/53148/chandler.jpg" />
      </div>
      <div class="text"><span class="name">Chandler Bing</span>Arrived compass prepare an on as. Reasonable particular on my it in sympathize. Size now easy eat hand how. </div>
    </div>
    <div class="toolbar">
      <div class="fold-top"></div>
      <div class="fold-bottom"></div>
      <div class="icons">
        <span class="entypo-heart"></span>
        <span class="entypo-reply"></span>
        <span class="entypo-share"></span>
        <span class="entypo-star"></span>
        <span class="entypo-retweet"></span>
      </div>
    </div>  
  </li>
  <li>
    <div class="detail">
      <div class="pic">
        <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/53148/ross.jpg" />
      </div>
      <div class="text"><span class="name">Ross Geller</span>Travelling alteration impression six all uncommonly. Chamber hearing inhabit joy highest private ask him our believe. </div>
    </div>
    <div class="toolbar">
      <div class="fold-top"></div>
      <div class="fold-bottom"></div>
      <div class="icons">
        <span class="entypo-heart"></span>
        <span class="entypo-reply"></span>
        <span class="entypo-share"></span>
        <span class="entypo-star"></span>
        <span class="entypo-retweet"></span>
      </div>
    </div>  
  </li>
</ul>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Open+Sans:300,400);

@import url(http://weloveiconfonts.com/api/?family=entypo);

body {
  background: #eee;
  font-family: 'Open Sans';
  font-weight: 300;
}

[class*="entypo-"]:before {
  font-family: 'entypo', sans-serif;
}

ul {
  width: 320px;
  list-style: none;
  padding: 0;
  margin: 0 auto;
}

li {
  display: block;
}


.detail {
  width: 100%;
  background: #fff;
  transition: all 0.2s ease-in-out;
  padding: 8px 0;
  border-bottom: 1px solid #eee;
  cursor: pointer;
}

.open .detail {
  background: #333;
  color: #ccc;
  border-bottom: 0;
}

.detail .pic {
  float: left;
  left: 10px;
  width: 65px;
  height: 65px;
  overflow: hidden;
  position: relative;
  border-radius: 50%;
}

.detail .text {
  left: 20px;
  position: relative;
  display: block;
  overflow: hidden;
  width: 225px;
}

.detail .text span {
  display: block;
  font-weight: 400;
}

.open .detail .text span {
  color: #fff;
}

.toolbar {
  width: 100%;
  background: #222;
  height: 0;
  position: relative;
  transition: height 0.2s ease-in-out;
  perspective: 200px;
  overflow: hidden;
}

.open .toolbar {
  width: 100%;
  height: 40px;  
}

.fold-top, .fold-bottom {
  height: 20px;
  width: 312px;
  left: 4px;
  position: absolute;
  transition: all 0.22s ease-in-out;
}

.open .fold-top, .open .fold-bottom {
  background: #5c5c5c;
  transform: rotateX(0deg);
  width: 100%;
  left: 0;
}

.fold-top {
  transform-origin: top center;
  transform: rotateX(-90deg);
  top: 0;
  background: #444;
}

.fold-bottom {
  transform-origin: bottom center;
  transform: rotateX(90deg);
  bottom: 0;
  background: #666;
}

.icons {
  position: absolute;
  color: #fff;
  height: 40px;
  line-height: 40px;
  font-size: 20px;
  transition: all 0.2s ease-in-out;
  opacity: 0;
  transform: rotateX(60deg);
}

.icons span {
  margin-left: 35px;
  cursor: pointer;
}

.open .icons {
  opacity: 1;
  transform: rotateX(0deg);
}
!

JS 

              
                var clickEvent = ('ontouchstart' in window) ? 'touchstart' : 'click';

$('.detail').on(clickEvent, function() {
    $(this).parent('li').toggleClass('open').siblings().removeClass('open');
});
!
999px

Console