You can add buttons to the content of any post or page using the following shortcode:

[button color="green" size="large" url="http://www.wpgoods.com"]Button Text[/button]
Button Text

The button shortcode takes 3 parameters: color, size and url. You may select yellow, red, blue, black, orange, green, purple, gray or pink for the color parameter. The size parameter determines whether the button is small, medium or large. For the url parameter, you must specify a valid URL.