How do I get the side of div to get up : How do I get the side of div to get up? The div is like this before I move the point over it:
[enter image description here][1]


And when I move the point over the div,it like this:
[enter image description here][2]

How should I write the HTML and CSS code?
  [1]: https://i.stack.imgur.com/UafDq.png
  [2]: https://i.stack.imgur.com/kG3bc.png