I agree with Ann. But test it yourself to see where it goes differently than you expect.
I downloaded the screenshot, opened it in Photoshop, and used the eyedropper to get the color value. Pure white.
Color and such are not my expertise. But I wondered if it could be the "brightness" or similar. If I zoom into a white area (so I am not distracted by changes in other areas), nothing I do makes it look any different - brightness, contrast, exposure, etc. In the text, the white pixels are already full white.