Making header smaller

Theme 2011, when looking at the source code, there is a text file <style type=”text/css” media=”screen”>
html { margin-top: 28px !important; }
* html body { margin-top: 28px !important; }
</style>

But I want the header to be closer to the top, where do I find this text file to change it? I can’t seem to find anything that allows me to shrink the header area in the css file. Maybe I missed it.

Also, in the css where would I find the post comment box to change that color to fit the rest of the page: https://www.turningdranch.com/blog/

Thanks for any help!
Tamra