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How to make lightbox media thumbnails square

Hello everybody!

I’m searching few hours already and can’t find the right answer on the forum. I have a problem with the image sizes in lightbox thumbnails when I open the gallery. It seems that for many people it covers the thumbnails automatically, into squares, but for me they all have different sizes.

To summarize:

How to make this

into this:

I will be really grateful for any help, thank you!

Here is my site Read-Only: https://preview.webflow.com/preview/hollow-project?utm_medium=preview_link&utm_source=dashboard&utm_content=hollow-project&preview=6d2fa1edde18f710dbd72383034b45ed&mode=preview