Problem with position DIV

Guys im totally new to this,i just finished HTML and im on CSS right now. I got a problem on the end of CSS courses Box Model. On 16/16 task i need to make web look fine,but i have problem in start. I just cant move div with class .share (box with SHARE FAVORITE READ) at bottom of page,its constantly on center of the page.
Here is link and i hope someone can help me. Thanks

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