Feature request: change TOTP color in the last 5-10 seconds of validity

[bitbooster]

Simple request: I'd like to have a visual cue, like changing color of the text or of the background (no flashing, please :) ), when a token is going to expire (from maybe 5-10s because its expiration).

A 'wilder' option could be instead that each new time interval is shown using a different color, in a palette of 2-3-4 of them.

The use case is that the user eyes only the first token digits and when she looks at the screen again to read the remaining ones, it should be easy to spot if in the meanwhile they have changed.