How to vertical center div? - I'm trying to make nice vertical dividers

Hi everyone!

I am trying to vertically center divs inside another div, using:

position: relative;
vertical-align: middle;

But it's not working! Does anyone know why?

On this page: http://www.jasonwangart.com/p/about-web.html , I am trying to make the dividers - the vertical black lines - be vertically centered within the parent div.

You can see my code here:

<!doctype html>
 
<style>
 
	.jw-1-about-centre-align
	{		
		width: 300%;

vertically centering a child insdie a div

Quick question ,

now suppose i have the following code

<div>
    <button class="btn btn-success">startquiz</button>
</div>

to center the button horizontally , what i do is in CSS i give the following code

div{
   text-align:center;
   height:400;
}

"text-align:center;" does the trick of centering the botton inside teh div in the center , horizontally , now see that the div is actually 400px in height . how do i vertically center the button in the center ?

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