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.

One way to customize labels is by adding an eye-catching background color to them. You can change the color of the entire page using a solid color, a gradient or even a picture using Publisher's ...

Learn how to set the background color for selected text (instead of the entire document) in TextEdit ...

It's easy to change the background color on Google Docs to customize your documents. Here's what you need to know to do it.