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.

In some cases, the new background color won't be visible, because the business card template has blocky designs layered over the actual card background, especially if you use a Publisher template.

Learn how to make Terminal use a user-defined background image each time you open a new window.