How do you create the buttons as demo site?

Please send me a screenshot for further questions.

Regards,
Dominic

Currently, My theme has using the style of the boostrap, you can see more information here: http://getbootstrap.com/2.3.2/components.html#buttonGroups

If you want to create the button as show in the same site. you can use the class.

Example:
/** Primary button/
Class: btn-primary
/** Info button/
Class: btn-info
/** Success button/
Class: btn-success
/** warning button/
Class: btn-warning
/** Danger button/
Class: btn-danger

Regards,
Dominic