Center a Div inside another Div when you don't know any widths (i.e. for various mobile devices)
So you have a responsive layout, and for the smallest format (mobile) you want to be able to center some Divs.
margin: 0 auto;
things only works when you know widths.... but you have several mobile devices with different widths....
Oh no..... what to do?
You can use this
Now that doesn't work on IE7 or less..... but this is mobile layout only.
So who cares?