JQuery Mobile: Use CSS to vertically center a DIV on the page

I have a homepage that is set to scale based on the device size.  I have set the header and footers to be fixed to the top/bottom of the page.  I have a DIV in the center with menu buttons on it.

I would like the DIV to be vertically centered based on the size of the page when rendered. I found a few solutions on here and the best one so far works but it seems to horizontally center it also which I cant figure out how to disable.

This is the solution I am referring to.... http://www.experts-exchange.com/viewCodeSnippet.jsp?codeSnippetId=8131290
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MLeehershAsked:
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David S.Commented:
This code is setting both the horizontal and vertical margins to 20%:
.vertical {height:300px;width:500px;margin:20%;border:solid 1px green; background:#ffc;}

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To only set the vertical margins, do this:
.vertical {height:300px;width:500px;margin:20% 0;border:solid 1px green; background:#ffc;}

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