If you're hoping to change the background color of a cell in a table within Google Docs, here's how to create one first: From the navigation menu, select Insert. Go to Table.

For example, you can change your posts' background color to match the color of your logo, which appears in your Tumblr sidebar. ... Type the following into the box labeled "Add Custom CSS": ...

How to Change the Background Color of a Specific Note on iPhone and iPad. Launch the Notes app on your iOS device. Create a note and start typing your note, or select an existing one from the list.