How can I put white space at the bottom of my website, so the floating div never overlaps

I found a lot of questions on stack overflow about getting rid of white space, but I can't seem to figure out how to put it in.

I have a bottom navigation on my site that floats with the page, but if the window is small, the bottom part of the page gets covered up. I would like to insert some white space at the bottom, so when the window is smaller than the length of the page you can still read it.

I've tried adding:

margin-bottom: 50px;
 padding-bottom: 50px;
 

to the div containing the top page content, but it doesn't work.

Is there something I am missing? Here's a demonstration: http://www.writingprompts.net/name-generator/

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