I tried working with Bootstrap 3 a few times last year, and while I liked the grid & responsive utility classes, everything else was just way too much. You can configure your Bootstrap build using their customizer to only include the grid, but for my needs I had to fork it (to make it work with LessPHP, without normalize.css, and because I needed to rename the xs, sm, lg class names). I uploaded the result to my github:


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