Modality WordPress Theme Non-Responsive on Mobile Device

Hello, Fellow WordPress Developer and User’s

I have this site that I am building for a friend/client, I enjoy the modality theme, however , I can’t figure out how to make the slider-images responsive for the mobile device.

Here is my site: https://m2contractingtx.com/

If someone knows how to fix this, then please help, and if I need to, I am willing to pay if need be to get this job done. This is a job for a client and I know a bit of CSS and PHP, but this theme has sooo many pages attached that I am confused on how I can do it and at this point I just need it fixed asap.

Any developers know how to fix it? Let me know.