Center home page buttons

im trying to get the home page buttons to aligns center like you have in your live preveiw but i cant seem to do it….this is what i have..is there a simpler way.

[row_container full_width="yes" dark="no" padded="yes" bgr_url="" bgr_parallax="yes"][column width="three" position="first"][button href="http://www.vitaleinspection.com/about-us/" target="_blank" css_classes="button_blue small_button"][icon icon="user"][/icon]About Us[/button][/column][column width="eight" position="last" ][button href="http://www.vitaleinspection.com/testimonials/" target="_blank" css_classes="button_orange small_button"][icon icon="user"][/icon]Testimonials[/button][/column][/row_container]

thank you