How to create blogspot template?

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Guys, I'm here again! I was recently in search of some simple 3 column templates for my blogspot blog. well, the good news is that i got a few of them. Now, what i want to do is that i wanna create some templates of my one and use it. Since the free template that i can get on the net have the ads in the bottom of the template, i don't wanna use them! I'm therefore in search of a software or an free online service that can create CSS templates for blosgpot blogs. Is there any software that is WYSIWYG and have some of the most useful and popular functions to create CSS templates?