If you scroll towards the bottom you will see an “about us” section, this has a carousel to the left on desktop. As you can see in the image below, I’ve set (I think) the col with the carousel to only be visible on desktop. However, it’s only being hidden on small screens.
I reckon dark mode is an age thing: Younger people I know love it, older people hate it. I’m in the latter and really can’t get on with it. Gives me a headache after a while.