Hello Tuanphan,
Could your solution also help for my issue with the Zion template? Also the official demo page is affected, when you hovering over the option fields in the middle,
https://zion-demo-de.squarespace.com/?nochrome=true
Since some days the hover pictures are no longer in full screen. The top of the page keeps display the original background. It would be nice if you can help me. The support has not answered yet. Thank you in advance.