Unfolding card

index.html

<div class="wrapper">
  
  <div class="left">
    <div class="front">
      <div class="sectionWrap">
        <h1>Title</h1>
        <hr>
        <p class="preview">Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum.</p>
        <button class="openB"><p>read more...</p></button>
      </div>
    </div>
    <div class="back">
      <div class="sectionWrap">
      <h1>Left</h1>
        <hr>
        <p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata</p>
      </div>
    </div>
  </div>
  <div class="middle">
    <div class="sectionWrap">
      <h1>Middle</h1>
        <hr>
        <p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata</p>
    </div>
  </div>
  <div class="right">
    <div class="sectionWrap">
      <h1>Right</h1>
        <hr>
        <p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata</p>
    </div>
    <button class="closeB">✕</button>
  </div>
  <footer>
    <a target="_blank" href="https://codepen.io/tobiasglaus/">
      <img src="https://cdn1.iconfinder.com/data/icons/simple-icons/256/codepen-256-black.png">
      <p>Check out my other pens</p>
    </a>
  </footer>
</div>

script.js

$(function(){
  $(".openB").click(function(){
    $(".left").addClass("open");
    setTimeout(function(){
      $(".right").addClass("open");
    }, 250);
    setTimeout(function(){
      $(".back").addClass("open");
    }, 350);
  });

  $(".closeB").click(function(){
    setTimeout(function(){
      $(".left").removeClass("open");
    }, 250);
    $(".right").removeClass("open");
    setTimeout(function(){
      $(".back").removeClass("open");
    }, 600);
  });
});

scripts

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>

style.css

*{
  margin:0;
  padding:0;
}
html, body{
  width:100%;
  height:100%;
  overflow:hidden;
  background: rgba(17,126,104,1);
  background: -moz-radial-gradient(center, ellipse cover, rgba(17,126,104,1) 0%, rgba(17,126,104,1) 25%, rgba(1,81,54,1) 100%);
  background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, rgba(17,126,104,1)), color-stop(25%, rgba(17,126,104,1)), color-stop(100%, rgba(1,81,54,1)));
  background: -webkit-radial-gradient(center, ellipse cover, rgba(17,126,104,1) 0%, rgba(17,126,104,1) 25%, rgba(1,81,54,1) 100%);
  background: -o-radial-gradient(center, ellipse cover, rgba(17,126,104,1) 0%, rgba(17,126,104,1) 25%, rgba(1,81,54,1) 100%);
  background: -ms-radial-gradient(center, ellipse cover, rgba(17,126,104,1) 0%, rgba(17,126,104,1) 25%, rgba(1,81,54,1) 100%);
  background: radial-gradient(ellipse at center, rgba(17,126,104,1) 0%, rgba(17,126,104,1) 25%, rgba(1,81,54,1) 100%);
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#117e68', endColorstr='#015136', GradientType=1 );
}
.wrapper{
  box-sizing:border-box;
  width:100%;
  height:100%;
  -webkit-perspective: 2000px;
  padding:5%;
  perspective: 2000px;
}
.left, .middle, .right{
  float:left;
  position:relative;
  height:100%;
  background-color:#fff;
  width:33%;
}
.left{
  transform-origin:100% 50%;
  transform: rotateY(180deg);
  transition:.7s ease-in-out;
  z-index:20;
}
.left.open{
  transform-origin:100% 50%;
  transform:rotateY(0deg);
  transition:.7s ease-in-out;
}
.right{
  transform-origin:0% 50%;
  transform:rotateY(-180deg);
  transition:.7s ease-in-out;
}
.right.open{
  transform-origin:0% 50%;
  transform:rotateY(0deg);
  transition:.7s ease-in-out;
}
.front, .back{
  height:100%;
  width:100%;
  position:absolute;
  top:0;
}
.front{
  transform:rotateY(180deg);
  background-color:#fff;
  z-index:5;
}
.back{
  background-color:#fff;
  z-index:4;
  backface-visibility:hidden;
  -webkit-backface-visibility:hidden;
}
.back.open{
  z-index:10;
}
.openB{
  background-color:transparent;
  border:2px solid rgba(0,0,0,0.5);
  padding:5px;
  position:absolute;
  min-width:120px;
  max-width:150px;
  z-index:50;
  bottom:30px;
  font-weight:400;
  font-size:1em;
  opacity:.7;
  transition:.2s ease-in-out;
  cursor:pointer;
}
.openB:hover{
  background-color:rgba(0,0,0,1);
  color:white;
  transition:.2s ease-in-out;
}
.closeB{
  position:absolute;
  border:none;
  background-color:rgba(0,0,0,0.6);
  color:white;
  z-index:50;
  width:50px;
  font-size:1.5em;
  cursor:pointer;
  height:50px;
  top:0;
  right:0;
  transition:.2s ease-in-out;
}
.closeB:hover{
  background-color:rgba(0,0,0,0.2);
  transition:.2s ease-in-out;
}
.preview{
  max-height:100px;
  overflow:hidden;
  text-overflow: ellipsis;
  content: "";
  position:relative;
  display:block;
}
.preview:before {
  content:'';
  width:100%;
  height:100%;    
  position:absolute;
  left:0;
  top:0;
  background:linear-gradient(transparent, white);
}
.sectionWrap{
  height:100%;
  width:100%;
  padding:40px;
  box-sizing:border-box;
  overflow:hidden;
}
h1{
  font-family: 'Playfair Display', serif;
  font-size:3em;
  line-height:1;
  color:#34495e;
}
p{
  font-family: 'Josefin Sans', sans-serif;
  font-size:1.2em;
  max-height:100px;
  text-overflow: clip;
}
hr{
  border:3px solid #34495e;
  width:30px;
  margin:12px 0 8px 1px;
  text-align:left;
}
footer{
  position:fixed;
  bottom:0;
  width:100%;
  height:50px;
  left:0;
  box-sizing:border-box;
  padding-right:30px;
}
footer img{
  height:50px;
  filter:invert(100%);
  float:left;
}
footer p{
  margin-top:13px;
}
footer a{
  color:#fff;
  text-decoration:none;
  display:inline-block;
  width:250px;
  float:right;
  opacity:1;
  transition:.2s ease-in-out;
}
footer a:hover{
  opacity:.6;
  transition:.2s ease-in-out;
}

styles

<link href="https://fonts.googleapis.com/css?family=Josefin+Sans:400,700|Playfair+Display:900" rel="stylesheet" />

unfolding-card.markdown

Unfolding card

A Pen by Tobias Glaus on CodePen.

License.

I love this effect of opening by unfolding.