By default, extension theme matches system (browser) theme

[rakleed]

Describe the feature you want:
It would be nice if, by default, the theme of the extension matches the system (browser) theme.

Why do you want this feature in Authenticator?
This is how most mobile and desktop applications and extensions work. And this is what most users expect.

[Sneezry]

prefers-color-scheme is a possible solution for this. https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme

[aceshigh1309]

.day {
background: #eee;
color: black;
}
.night {
background: #333;
color: white;
}

@media (prefers-color-scheme: dark) {
.day.dark-scheme {
background: #333;
color: white;
}
.night.dark-scheme {
background: black;
color: #ddd;
}
}

@media (prefers-color-scheme: light) {
.day.light-scheme {
background: white;
color: #555;
}
.night.light-scheme {
background: #eee;
color: black;
}
}

.day,
.night {
display: inline-block;
padding: 1em;
width: 7em;
height: 2em;
vertical-align: middle;
}