bootstrap.css is the main css for BootStrap, which defines the whole style for various controls / components, where bootstrap-theme.css defines themes (gradient / animation) for buttons, drop-down menus, navigation bars, progress panels, panels.
In most cases, adding bootstrap.css enough for bootstrap.css to work, but for gradient / animation you can use bootstrap-theme.css .
You can see the difference at http://getbootstrap.com/css/#buttons , and then click the "Preview" button from the affix menu (fixed menu on the right)
Kishore Kumar Dec 10 '14 at 11:55 2014-12-10 11:55
source share