Video Size

Hi

I’m using WP Video Lightbox plugin and created sample page on our website and wrote this shortcode on this sample page:
[video_lightbox_youtube video_id=”ZjXTUC23Sig&rel=false” width=”640″ height=”480″ auto_thumb=”1″]
My question is how can I configure the size of this sample video on this page to be like of this video on this website: https://hdpopcorns.com/darkest-hour-2017-720p-1080p/
This website uses Video Lightbox plugin too.
Also, I don’t want to see black spaces on the top and down the video. Can you help me with that

Thanks

The page I need help with: [log in to see the link]