HTML adding margin at top

Just logged into a site I’m working on and noticed something new.

`<!– We need this for debugging –>
<!– Responsive 1.9.3.2 –>
<!– Responsive Child Theme 1.9.3.1 –>
<style type=”text/css” media=”print”>#wpadminbar { display:none; }</style>
<style type=”text/css” media=”screen”>
html { margin-top: 28px !important; }
* html body { margin-top: 28px !important; }
</style>

Now I have 28 px of margin at the top of my site that I can’t get rid of. I can’t find the code anywhere to delete. Where is it and how do I kill it?