The ipython laptop (web interface for ipython) uses standard html / css to determine the look. If you make changes to these files, this will change the look of your ipython laptop.
Find the egg distribution on ipython. I installed mine using easy_install, so my path is as follows:
/usr/lib/python2.6/site-packages/ipython-0.12.1-py2.6.egg/IPython/frontend/html/notebook/static/css
Basically you just want to find the ipython installation location, then go to the path shown above. Update your css, restart your ipython server, and you should be good to go.
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