Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Follow the steps here to change your Zoom background and just make sure your picture's dimensions are 1,920 pixels by 1,080 pixels (or close to it).
Source: https://www.popsugar.com/tech/free-zoom-backgrounds-47373979
This is usually a slider that controls how dark the picture's darkest areas can get.