[Mobile responsive] Lightbox image size

Hi!

First of all, thanks for your work on this useful plugin. As a beginner in WordPress, it helps me a lot to shape the portfolio of my dream.

Now here’s my problem : everything works fine except lightboxes in mobile version.
I choose to put in the different squares of my gallery each of my works, and in their own lightboxes their development.
https://zupimages.net/up/19/24/ivr7.png
https://zupimages.net/up/19/24/igsw.png
I figured out the good size to fill the container in Desktop and tablet versions but it’s quite too big in mobile version.
https://zupimages.net/up/19/24/qij6.jpg
I look for Lightbox options, Aspect, Custom Image size but it did not changes anything.
There’s no CSS changes included.

I’m able to find a way by opening the image in a second window but it’s a bit annoying for the visitor.

I’m available for your feedbacks if there’s any. Thanks for reading my request!

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