css only slide box interface

HTML

<input type="checkbox" name="slide" id="slide" />
<input type="checkbox" name="slideup" id="slideup" />
<input type="checkbox" name="slidedown" id="slidedown" />
<input type="checkbox" name="pop" id="pop" />
<input type="checkbox" name="fade" class="fade" />
<input type="checkbox" name="flip" id="flip" />
<input type="checkbox" name="swap" id="swap" />


<div id="main">
  <h1>Input Checkbox transition effects</h1>
  <p>Please select transition effect from the list below.</p>
  <menu>
    <li><label for="slide" onclick="">Slide</label></li>
    <li><label for="slideup" onclick="">Slide Up</label></li>
    <li><label for="slidedown" onclick="">Slide Down</label></li>
    <li><label for="pop" onclick="">Pop</label></li>
    <li><label for="fade" onclick="">Fade</label></li>
    <li><label for="flip" onclick="">Flip</label></li>
    <li><label for="swap" onclick="">Swap</label></li>
  </menu>
</div>

<div id="slide-container">
  <div>
    <h1>Slide</h1>
    <p>Slide transition sample.<br />It returns when the button below is pushed.</p>
    <label for="slide" class="back" onclick="">Back</label>
  </div>
</div>

<div id="slideup-container">
  <div>
    <h1>Slide Up</h1>
    <p>Slide Up transition sample.<br />It returns when the button below is pushed.</p>
    <label for="slideup" class="back" onclick="">Back</label>
  </div>
</div>

<div id="slidedown-container">
  <div>
    <h1>Slide Down</h1>
    <p>Slide Down transition sample.<br />It returns when the button below is pushed.</p>
    <label for="slidedown" class="back" onclick="">Back</label>
  </div>
</div>

<div id="pop-container">
  <div>
    <h1>Pop</h1>
    <p>Pop transition sample.<br />It returns when the button below is pushed.</p>
    <label for="pop" class="back" onclick="">Back</label>
  </div>
</div>

<div class="fade-container">
  <div>
    <h1>Fade</h1>
    <p>Fade transition sample.<br />It returns when the button below is pushed.</p>
    <label for="fade">Back</label>
  
  </div>
</div>

<div...

CSS

html,body {
  overflow: hidden;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  background: -moz-linear-gradient(top, #000, #000 50%, #333);
  background: -webkit-linear-gradient(top, #000, #000 50%, #333);
}
input {
  display: none;
}
menu,li {
  list-style: none;
  padding: 0;
}
body > div {
  position: absolute;
  width: 90%;
  height: 97%;
  padding: 3% 5% 0;
  background: #ccc;
  z-index: 0;
  -moz-transition: 0.5s;
  -webkit-transition: 0.5s;
}
body > div:not(#main) {
  display: -moz-box;
  display: -webkit-box;
  background: #aaa;
}
body > div:not(#main) > div {
  width: 90%;
  height: 83%;
  margin: 2% 0 5%;
  padding: 5%;
  background: -moz-linear-gradient(top, #f0f0f0, #fff 70%, #fff);
  background: -webkit-linear-gradient(top, #f0f0f0, #fff 70%, #fff);
  border-radius: 7px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.4);
}
h1 {
  margin: 0 0 0.4em;
  text-align: center;
  font-size: 240%;
  line-height: 1.3;
  color: #333;
  text-shadow: 0 1px 0 rgba(255,255,255,0.8), 0 -1px 0 #000;
}
menu {
  border: 1px solid #bbb;
  border-radius: 7px;
  background: #fff;
  box-shadow: 0 2px 5px rgba(0,0,0,0.4);
}
menu li {
  border-bottom: 1px solid #ccc;
}
menu li:hover {
  border-bottom-color: #bbb;
}
menu li:last-child {
  border: 0;
}
menu li label {
  display: block;
  padding: 0.55em 1em;
  font-weight: bold;
  font-size: 90%;
  letter-spacing: 1px;
  color: #444;
  background: -moz-linear-gradient(top, #fff, #eee);
  background: -webkit-linear-gradient(top, #fff, #eee);
  text-shadow: 0 1px 0 rgba(255,255,255,0.8);
}
menu li:first-child label {
  -moz-border-radius-topleft: 7px;
  -moz-border-radius-topright: 7px;
  -webkit-border-top-left-radius: 7px;
  -webkit-border-top-right-radius: 7px;
}
menu li:last-child label {
  -moz-border-radius-bottomleft: 7px;
  -moz-border-radius-bottomright: 7px;
  -webkit-border-bottom-left-radius: 7px;
  -webkit-border-bottom-right-radius: 7px;
}
menu li label:after {
  float: right;
  content: '＞';
  font-weight:...