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Hide grid lines in the published version. Only in the Chrome and Firefox browser on the Home page. In safari it doesn't happen

I have transferred a project to another account and when I publish it again you can see the lines of the grid on the home page. This only happens in Chrome and Firefox browsers, in Safari you don’t see the lines. Do you know how I could hide them? I’m about to submit a project and I have this problem :frowning:

Here is my site Read-Only: