centering header at tablet size

www.rebecca-rosenberg.com: At tablet size, trying to get the site-title, site-description and the Header Right Sidebar (Contains social icons/Connect with Rebecca) to center horizontally on the page. Instead of the Header Right Sidebar staying on the right. Can you help, please? @media only screen and (min-width: 960px) and (max-width: 1024px) {#site-title, #site-title a, #site-description { ??? } } @media only screen and (min-width: 960px) and (max-width: 1024px) {#custom_html-4.widget_custom_html { ??? } }