Reverse video

For emphasis, the color scheme was swapped to bright background with dark text.

Nowadays the two tend to be switched, since most computers today default to white as a background color.

Video is usually reversed by inverting the brightness values of the pixels of the involved region of the display.

When most computer displays were light-on-dark, it was found that users looking back and forth between a white paper and dark screen would experience eyestrain due to their pupils constantly dilating and contracting.

[2] Today, people with visual impairments such as ocular toxocariasis may find it less tiring to the eyes to work with a predominantly black screen, since modern operating systems usually display a lot of white in a normal use.

Example with normally light text:
Visicalc displays column and row headers in reverse video. The "TOTAL" label is also reversed.
Example with normally dark text:
ERP5 displays the current selection in a drop-down list in reverse video.