Thanks so much for the rebuild, it looks good on desktop and mobile now.
(It’s a shame that we still can’t copy/paste between sites yet.)
I have recreated the slider, setting-by-setting, and found a small bug:
For the Heading element “text-slide”, even though the Text Align setting inherited the value of ‘Center’ from ‘Section’ and ‘Main’, the text inside was left aligned. I had to re-click the already-selected ‘Center’ setting.
After recreating the slider you made, it seems to display wrong on mobile for some reason. Did you have to customise the smaller viewports? I thought Flexbox should do that automagically, right?