In OSX would it be possible to change the background colour and/or text colour of the address/search bar input field of a browser (Chrome, Safari, etc)? Not just the highlight colour (System Prefs > General > Highlight color) but as a permanent colour change, independent of focused or highlight state.
Mock up attached.
I'm completely new to OSX/app development and have no idea if this style setting made in the operating system or in the browser app? (Or if it's even possible to change at all).