They’re quite random and can be weird,” said Esther, a 16-year-old who runs a meme-and-theme account and, like all the others under 18 in this story, is referred to by her first name only.

Work has since continued on light theme for Chrome OS, and at the same time the default dark theme has begun to get darker. For years, Chrome OS’s UI has lived somewhere between light and dark.

Chrome OS is going in the opposite direction by bringing a dedicated light theme, which we managed to get our hands on early. With a dedicated system-wide theme switcher, apps for Android and iOS ...