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Got the buttons to do what I wanted to, but ended up making two separate containers to hold mobile and desktop layouts and hide them from respective viewports. There must be an easier way to do this, but this is what I came up with. Any comments or feedback is appreciated! Thanks!

First JS project on Frontend Mentor. Any comments/feedback is welcomed and appreciated. Thanks!

Extra HTML/CSS practice. Any comments/feedback is appreciated. Thanks!

Made updates from previous comments. Any feedback would be helpful! Thanks!