CSS :default pseudo-class

The :default pseudo-class will target the default element in a form in a group of similar elements.

In case you need to target the default button in a form that does not have a class, you can use the :default pseudo-class.

Note

"Reset" or "Clear" buttons in forms have serious usability issues. Avoid using them unless is strictly necessary. Here are some notes about why not to use them:

• Reset and Cancel Buttons - Nielsen Norman Group (2000)
• Killing the Cancel Button on Forms for Good - UX Movement (2010)