@raman88825 as the admin stated in the previous post…
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publish your website
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then edit site.css
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then visit your website and clear your browser cache
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you should see rounded corners
I tested twice, once directly through the browser and the second time on the hosting itself
P.S. always remember that when you make some changes in that editor
to edit the site.css file again because, as we mentioned, it will probably be overwritten.
Before I suggested the CSS thing to you
I tried to see if maybe I could put it (in GUI) as a setting on the parent…so I got all the way to the <body> section but it just doesn’t offer that…
I see that it offers on some things like img. background etc…
Maybe if someone would contact them and give them a suggestion they would consider and enable that option for galleries as well, but maybe that option exists on the pro version, so that’s the difference
or is the intention to make a simple tool for quickly creating a website, and what you want is considered advanced options for which they did not bother.
But I think it’s not a problem for you to edit that CSS file manually
and also learn something along the way 