Add the background color in Word.
Add or change the background color.
1.Go to Design then Page Color.
2. Choose the color you want under Theme Colors or Standard Colors.
Note :
If you don't see the color you want, select More Colors, and then choose a color from the Colors box.
To add a gradient, texture, pattern, or picture, select Fill Effects, and then go to Gradient, Texture, Pattern, or Picture and select an option.