Navbar bordering entire page?

Hi everyone, I’m currently working on the portfolio project and (very) slowly figuring things out as I go. Right now I’m having a lot of difficulty with successfully implementing a top-fixed navigation bar. For some reason, when I add it to my page, the navbar messes up the alignment of my text and appears to border the entire page. I have no idea why this is happening and how I can go about fixing it. Any advice would be really appreciated. Here is my CodePen project: https://codepen.io/rasseda/pen/GMKaLr The troublesome navbar is at the top of my HTML code.

EDIT: D’oh, I’m a dummy. Turns out I was nesting everything inside of the navbar, so all of my tag styles were messing with it. Can’t believe I missed that for the better part of an hour…