Where can I get CSS styles for prompt Mozilla Firefox?

Question

css

Hello colleagues. There was a task to make a modal window for entering a login and password as a prompt in Mozilla Firefox. The matter is that I cannot receive styles for this window, on the Internet the necessary result did not find. Perhaps someone already had a similar task, or knows where you can look at the styles to make such a modal window? I'll add a screenshot to give you a better idea of ​​what's going on.

Answer 1

All styles for the Firefox interface can be found in their repository , but you need to understand that there is a lot of code there .
Also, do not forget that most likely the appearance of this window differs depending on the platform, what you give is the appearance for Windows, but Firefox is a cross-platform application. Do not forget also about the presence of different color themes for which the browser UI adapts. In general, the task is more difficult than you may think.
There is such a thing as system colors , look in their direction as a source of information about colors.

Answer 2

$PROFILE/chrome/userChrome.css
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tyks