How to set a responsive size for banners to display in the mobile version of Opencart?

Question

opencart

Hello! Please tell me what needs to be written in css, in order for the banners to be displayed in full size, on devices with an extension of 767 px and below - down one after another, as in the screenshot



. Now, for some reason, they have become completely miniature and look like this:


Link to the site https://cosmozoo.com.ua
I would be very grateful for any hint or help!

Answer 1

The issue was resolved by itself by resetting the modifiers, by accident))

Answer 2

m-section m-bottom m-bottom1 visible
m-bottom1 - what is it? This class compresses banners for you...