How to change header dimensions in WordPress?

How can I alter the requirements for the header dimensions so that I can take an uncropped image and fill the top section (centring the whole image) instead of having white space at the top? I would prefer to just be able to edit the CSS and not bother with child themes, as I don’t think I will ever need to upgrade the theme.

Here is my site http://carolbadre.wordpress.com/

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and here is the uncropped image:
http://math.stanford.edu/~vakil/11-245/grr.png

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1 comment

  1. Put that code (this is the output):

    <a href="http://carolbadre.wordpress.com/">
    <img width="1000" alt="" src="http://carolbadre.files.wordpress.com/2012/03/cropped-grr.jpg">
    </a>
    

    Which must look different in the backend inside a div
    Then you can css it and use height: auto..