To get the correct styling for buttons, you need to use the class names specified below. Follow the Bootstrap 2.3 class name standard. Please note that:
No default styling is applied to buttons.
The styling works for both input elements of the submit type as well as button and a elements.
Use the btn-primary class for actions where the user is creating or saving something. This includes a Login button. The btn-danger class is used for deleting actions where a warning is appropriate. For all other buttons, like Search, Cancel or Update filter, use the btn class only.
Sizes
Disabled Buttons
Button Groups
A button group is used for connected buttons, e.g. in a toolbar.