Does WordPress 'out of the box' come with any default CSS? Especially for use in themes? As an example, does it have its own Grid CSS setup where I can create grids without needing an external dependency like Bootstrap Twitter?
I am developing a simple plugin similar to
Visual Composer. It will allow the user to create HTML components. If WordPress has default CSS for grids, I can create the HTML components using that grid CSS rather than relying on Bootstrap Twitter (which could conflict with the users theme).