The default project background color of WireframePro is white. However the background color can be set before project is created and it can be also changed anytime later from page's grid settings.
Note: Background color is applied common for all pages in that project and it cannot be set individually per page.
1Set project background as transparent.
2Set the project background as white.
1Open page settings.
2Disable transparent background.
3Choose any background color.