Fix inputs not readable when using a light on dark default stylesheet
The default Debian CSS theme used throughout Debian websites has a yellow background highlight for selected input controls.
Unfortunately it only changes the background on focus and not the foreground. So if you use a default stylesheet for your browser with light text on dark background you end-up with light/white/grey text on light yellow background which is not readable.
This oneliner also sets the foreground color to get a readable color scheme for focused elements.
I tested by live changing the stylesheet in browser on both light on dark and dark on light default stylesheets.