Hi - I also am having this issues, my site is older, not the 7.1
https://www.existinspired.com/about
On mobile mode there is a large blank white space between the menu top and the content of the page. Also the header cover image of my site displays weird on mobile mode...
I've tried most of the custom CSS shared here, none worked for me... maybe I am doing it wrong. Please advise, thank you!