从上到下变化

Question

任何人都可以帮助我更改此幻灯片切换从顶部向下滑动从底部向上滑动。我找了一个，但这是我能找到的唯一一个。我试图改变所有从上到下但它没有用。

{
  margin:0;
  padding:0;
  font-family:"Helvetica Neue", Helvetica, Sans-serif;
  word-spacing:-2px;
}

h1 {
  font-size:40px;
  font-weight:bold;
  color:#191919;
  -webkit-font-smoothing: antialiased;
}

h2 {
  font-weight:normal;
  font-size:20px;
  color:#888;
  padding:5px 0;
}

.message {
background:#181818;
color:#FFF;
position: absolute;
top: -250px;
left: 0;
width: 100%;
height: 250px;
padding: 20px;
transition: top 300ms cubic-bezier(0.17, 0.04, 0.03, 0.94);
overflow: hidden;
box-sizing: border-box;
  
}

.message h1 {
  color:#FFF;
}

#toggle {
  position:absolute;
  appearance:none;
  cursor:pointer;
  left:-100%;
  top:-100%;
}

#toggle + label {
  position:absolute;
  cursor:pointer;
  padding:10px;
  background: #26ae90;
width: 100px;
border-radius: 3px;
padding: 8px 10px;
color: #FFF;
line-height:20px;
font-size:12px;
text-align:center;
-webkit-font-smoothing: antialiased;
cursor: pointer;
  margin:20px 50px;
  transition:all 500ms ease;
}
#toggle + label:after {
  content:"Open" 
}

.container {
transition: margin 300ms cubic-bezier(0.17, 0.04, 0.03, 0.94);
padding:5em 3em;
}

#toggle:checked ~ .message {
  top: 0;
}

#toggle:checked ~ .container {
  margin-top: 250px;
}

#toggle:checked + label {
  background:#dd6149;
}

#toggle:checked + label:after {
  content:"Close"
}

<input type="checkbox" name="toggle" id="toggle" />
<label for="toggle"></label>
<div class="container">
<h1>Pure CSS3 Slide Down Toggle Demo</h1>
<h2> Click the Open button to see hidden mesage.</h2>
</div>
<div class="message"><h1> hello, I'm a hidden message. You found it.</h1>
<h2>Now Click the Heart button in the bottom to support CSS3</h2>
</div>