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

       <div id="dummyid">
          <div id="outer_wrapper">
                echo date('g:ia \o\n l jS F Y');

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