Class

Defines

W3-btn

A rectangular button with a shadow hover effect.
Default color is black.

W3-button

A rectangular button with a gray hover effect.
Default color is light-gray in W3.CSS version 3.
Default color is inherited from parent element in version 4.

W3-bar

A horizontal bar that can be used to group buttons together.
(Perfect for horizontal navigation menus)

W3-block

Class that can be used to define a full width (100%) button.

W3-circle

Can be used to define a circular button.

W3-ripple

Can be used to create a ripple effect.