Epic WordPress Theme - WordPress - How can I make the Galleria slider center on resize?

How can I make the Galleria slider center on resize?

Open “css/galleria-classic.css, go to .galleria-container { and add:

margin:auto;

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ignitethemes

Last Update	30 June 15
Created	12 January 12
High Resolution	No
Widget Ready	Yes
Compatible Browsers	IE9, IE10, IE11, Firefox, Safari, Opera, Chrome, Edge
Software Version	WordPress 4.6.1
ThemeForest Files Included	Layered PSD, PHP Files, CSS Files, JS Files
Columns	4+
Documentation	Well Documented
Layout	Fixed
Tags	3d slider, blog, business, corporate, dark skin, fashion, google fonts, ignitethemes, kenburns effect, light skin, multiple portfolios, multiple sidebars, photography, pricing table, video slider