WordPress' built-in editor has an HTML mode that lets you override the background color of a post by changing its CSS (Cascading Style Sheet) background-color attribute to the color of your choice.

If you can't include your company logo in a presentation because of its unsightly background, use this PowerPoint trick to make that background disappear. Adding your company logo to a ...

this time to say your logo has to look good on a "purely white background." So you need to test to make sure your logo is visible and I guess attractive on a white background. The guidelines have ...