This is an easy to answer question. All variables are inside variables.less
I recommend you not edit bootstrap original files. But instead create in a parent folder your own file and reproduce bootstrap.less root file with adjusted paths. Then. Create your own variables.less file thatyour new recreated fille will call. Then, in your own variables.less file. First then overwrite any variables you want to change. All other variables will be from original variables file and be merged in compilation. I have an article on http://htmlcsstherightway.org/ explaining this with detail. Hope it makes sense to you. Best regards. Renoir
