I tried changing colors in the darkblue-borders stylesheet through the admin panel editor and saving it, the .css file was writeable, but the colors did not change.
Then I tried editing the color codes into the stylesheet and uploading it by ftp overwriting the existing file, but the changes still do not take effect.
Then I tried taking the code from a green stylesheet and creating a stylesheet with the darkblue-borders name and uploading that, overwriting the existing darkblue-borders stylesheet (just to see if I could get any visible change), still no change.
This should be easy.

I emptied my browser cache. Where are classified files cached?
When I switch from one stylesheet to another, the colors
do change. Any idea what I might be doing wrong?
Thank you.
Carol