Multiple pages css grid

Beginners
1

I produced an index page with css grid and it looked fine and I could use the open css grid button to use the css grid editor. Then I duplicated the page and called it other.html, and changed the layout of the grid on the new page using the visual editor. Now when I open the index page, the code is correct for the grid on that page, and the page looks fine, but when I press the edit css grid button I cannot access the visual editor. Any suggestions would be appreciated please