[Help Wordpress] how do i get the video to show like in the demo?

how do i get the video to show like in the demo?

im adding youtube videos in the gallery.
but it doesn't turn out like this
http://dimsemenov.com/plugins/royal-slider/video-gallery/

i tried different templates but doesn't turn out as nice as that.
the video size appeared is rather small and doesn't make full width of my wordpress template.

how do i get it to look like
http://dimsemenov.com/plugins/royal-slider/video-gallery/
 ?

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