Css Sticky

HTML

==============================================

<h4>Scroll to see the sticky element <em>sticking</em></h4>
<div class="extra"></div>
<br />
<div id="wrapper">
  <div id="sticky">
    sticky
  </div>
</div>
<br />
<div class="extra"></div>

CSS

==============================
#sticky {
  position: sticky;
  background: #F762BC;
  width: 100px;
  height: 100px;
  top: 70px;
  left: 10px;
  display: flex;
  justify-content:center;
  align-items:center;
  box-shadow: 0 0 6px #000;
  text-shadow: 0 0 4px #fff
}

#wrapper {
  width: 75%;
  margin: auto;
  height: 400px;
  background-color: #ccc;
}

.extra{
  background: #ccc;
  width: 75%;
  margin: auto;
  height: 100px;
}

body {
  height: 1000px;
  font-family: georgia;
}
h4{
  text-align: center;
}

Link http://codepen.io/rpsthecoder/pen/zGYXEX?editors=1100