A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
You have to use the Conditional Formatting.
Highlight the cells that contain the numbers to be colored**.**
Go to Home >> Styles >> Conditional Formatting >> Highlight Cells Rules
Apply Greater than 0 and Less than 0 rules on the same range, and select the color that you want to format these cells when the condition is TRUE.