The official portrait, released on Monday by the White House, features a somber Mr. Trump against a dark backdrop.

This so-called blue light is a high-energy visible ... great about reading stuff on your phone with dark mode turned on. Black text on a white background makes for the best readability, hence ...

Dim the brightness on your devices. This is often called night mode or dark mode. It changes the background from white to black. Install blue light-filtering apps on smartphones, tablets ...

A new official portrait shows President Donald Trump wearing a red tie and a stern expression, in close-up against a dark ...