How to get rid of the border around urlbar upon clicking

I tried to set the background colour for my urlbar with #urlbar-input-container { border: none !important; border-radius: 5px !important; background: light-dark(#ffffffff, #1b1e20ff) !important; } this works fine for the most part, except on focus it creates some corner effects, which I think might be from the border that gets overlapped somehow.

And this is how it looks on focus without my code