Navigation style

I am struggling with css, so I hope someone just has a quick answer.

How do I change the link appearance in the navigation at the top of
to remove the white borders, around the text in the links for Collections, Items, etc.

I want to match the appearance of similar list at the top of

so ideally I would want to center everything and have the text white in the monitor display but I have not been able to get very far.

#primary-nav .nav-item > a {
   border: none;
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