height 100%--repeat background to fill web browser

I seem to be having a lot of problems with this issue. My wrapper 100% height is working, but the div inside will not do 100% height. Any idea on how to fix or a work around to this issue?

See code below
HTML:

<html>
    <body>
       <div id="dummyid">
          <div id="outer_wrapper">
             <?PHP
                echo date('g:ia \o\n l jS F Y');
             ?>
             <p>hmmmm</p>

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