Cannot find the style sheet

I just built a website using a downloaded template.  It works fine when I test it on my computer, but there is no css file in the files Panel and when I download on the public server, there is no formatting.  I am tired of the style sheet that came with the model, but I made so many changes, I is not good either.  I searched my computer for the .css files and don't get anything done with a current date.  Help!  There is no point in showing with the host it is not just made up because there is no css with her file.