Centering 2 Divs inside another vertically

Question

I have 2 divs that I want to centre vertically inside another div. At the moment I have:

http://jsfiddle.net/5vpA3/1/

Now I understand what is going on here, but

Answer 1

Flexbox solution to center vertically:

#container {
    display: flex;
    align-items: center;
}

OP's original fiddle modified: http://jsfiddle.net/o3pmyb8c/

If you would like to also center horizontally you can add justify-content: center;

Answer 2

Live Demo

• Remove float: left from #left and #right.

• Instead, use display: inline-block:

  #left, #right {
      display: inline-block;
      vertical-align: middle;
  }
  

• Due to using display: inline-block, you have to deal with the whitespace issue. I chose to remove the whitespace in the HTML between </div> and <div id="right">. See here for what happens if you don't do that. Removing the whitespace really is the easiest fix, but there are other ways.