You can easily change the background color to your liking.
To change the background color:
Click the color well of the color you like to change:
The system color picker appears:
Use the color picker to change the color to your liking.
You can use the dropping glass on the color picker to pick a color from your document.
When clicked, the cursor changes to a magnification glass. Then move the mouse pointer over the part of your document where you like to sample a color and click the mouse. You can use the Color Picker as usual to fine tune the sampled color.