Changing appearance of page names

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Hi, everyone.

Here's my situation: I just created a sub-page, and the page name is clickable from the parent page, but I want to make the link to the sub-page a button instead of text.

I've figured out how to do that with regular links, but when it's a page name and I click edit, I see options for navigation etc., but not for editing the link appearance.

I'm very new at this.

Thank you for your help. :)