WPyogi on "Centering Footer"

Try this CSS:

.footer-widgets, .footer-widgets .block {
    display: table;
    float: none;
    margin: 0 auto;
}

BTW, any changes you've made to theme files will be lost when the theme is updated. It's generally better to use a child theme -

http://codex.wordpress.org/Child_Themes

For additional help, you should contact the developers of your theme - as these forums really only support themes from the repository on this site.