The Stack Overflow colors are Stack Overflow Princeton Orange, Stack Overflow Raisin Black, Gray (X11), we recommend using the Stack Overflow color palette for personal projects and in the case of commercial use to visit the company website. The color codes: RGB, CYMK for print, and Hex for web HTML/CSS. Stack Overflow Official Website
Download the Stack Overflow color scheme palette image with the color hex codes as a single image. These are the suggested colors to be used for digital media.