I'm rendering a CommandButton with only an icon inside a container with a dark background with gradient and I have set the background color of the button to be transparent. (Note that it is transparent because the container's background color has a gradient.)
The problem I have is that since the default focus outline for the button is black and it's not visible against the dark background. How can I change this so that the focus outline becomes the invert color of the primary color?
I can always attach a custom CSS to change the outline color, but I'm looking for the correct way supported by the Fluent UI framework. I noticed that the Button component puts a white background color when the primary=true prop is specified. So, there seems to be a way to change the outline color, but I could not really figure out how. I also looked into the source code, and it takes a theme object and generates a class name, but this still did not tell me the full story.
There are sometimes
::afterselectors in play with FluentUI focus behavior. The "Chrome version >= 86" portion of this answer shows how to put Chrome in a state that will yet you inspect your components without losing focus in the page when you navigate in DevTools.When I encounter focus styling that I want to change in Fluent, I can find out what's applying the styles I wish to alter using this method and then override them.