Sample bootstap template with separate style sheet for colors / fonts / classes etc

I want to choose a free bootstrap template and have a separate style sheet to have settings for common changes I make. The content and images do not matter I will change those, I do not need a page designed. I just want a central style sheet I can amend with settings and / or classes that override the bootstrap settings. So by changing one stylesheet or changing classes in bootstrap I can define settings for <p>, <span>, text, (font, size, colors), H1,2,3,4,5,6, menu (font, colour, background color, dropdown font colour, background colour, hover etc. Basically I need the main Bootstrap css settings / classes that define main page appearance separated in one css so I can make all changes i n one css file. I do not need any design done, content written, or images created. I do not need to be able to change the structure of the page. I just want the ability to change all colors, fonts, sizes from one css file. I dont care if I have to use different classes as long as they are defined in the css file. I can amend bootstrap pages myself but I dont want to have to amend the bootstrap css files I want one central css I can change. So in short - standard bootstrap template i will choose and css file that changes attributes or where necessary new classes that override bootstrap that I can amend and use in bootstrap. Simply the bootstrap formatting / colors in one css file. I dont need full commenting just things like Paragraph style, H1,2,3,4,5,6, menu style, etc so I can easily find what I want. I say once more, simple project no designing, no creating pages, just existing template with centralised styling in one file easily readable and amendable - small job - no stupid bids, only original bid price will be accepted, time = 1 day