Framed content off center in mobile

I am using the lightbox shortcode to play a youtube video using a custom thumbnail image as the play button, wrapped in a shortcode to display the whole thing in a frame, one in each column in a 3 column row at https://www.fleettransportservice.com/

You can see it about half way down the page where the three video thumbnails are.

If you look closely, the 3 frames aren’t exactly centered. I have tried decreasing the size of the width of each video, but I don’t want them any smaller.

The issue is small on desktop, but on mobile it’s bigger. If you look at the same site on phone, those three videos are placed single column of course, but they are very off center to the right.

The columns are not being generated with Ult Shortcodes. It’s the theme’s page builder function that lets you set up columns.

Any idea how to get these framed images to show up centered on all devices, or this an incompatibility issue with the theme and the Ult Shortcodes plugin?

Thanks,
Rob

https://www.ads-software.com/plugins/shortcodes-ultimate/