>How do you override the style defined in the Chrome “user agent stylesheet”?
>
>For example, I have a UL element on a page that in the Chrome Development Tools shows properties as in “user agent stylesheet”. This UL is shown as sized to be 608 by 63px which is not enough (width) to show all LI elements in one line. So the last LI element breaks into the next line. (IE 10 does not have this problem).
>
>I am trying figure how to override this webkit engine behavior (the same problem occurs on iPad browser).
>I am guessing that the problem rests with the “user agent stylesheet” but if you see that I can be resolved in another way, please let me know.

The 'user agent stylesheet' settings are just the styles built into the browser - a default if you provide nothing else. It's common practice to completely override these so that you start with a clean slate for all browsers. Plenty of examples around - first one I found : http://meyerweb.com/eric/tools/css/reset/

Simply make sure this is the first stylesheet loaded then build your own requirements on top of that. I thought that if you use Bootstrap it pretty much did this anyway?