Assistance requested...Portfolio page

Greetings, I copied this code that is supposed to be the start of tabs going across the top of my page, but, instead the list is displaying vertically?
Any help is appreciated. Thanks

https://codepen.io/Meadows1/pen/0077899547f9ad1bd2e66f4900ede920

Hello – lists will always display vertically without some extra CSS magic, which I don’t see in the example. Check out the additional CSS here:
https://www.w3schools.com/css/css_navbar.asp

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Thanks, I suppose I must resist thinking I can trust YouTube videos to replace actually thinking.

Thanks again!