Cover art Size

Hello,

I recently installed the Huzzaz plugin to my site. Once I embedded the shortcode to my video gallery everything was fine, but the covert art image shows really small and does not fill the whole space. Is there any way I can fix this. The site page is
https://www.lipbusiness.com/music-videos/

https://www.ads-software.com/plugins/huzzaz-video-gallery/