How to Edit a Tumblr Background. You can edit a few attributes of the default theme in Tumblr through the Web interface, including the background color and header image. For example, you can edit ...

Different Tumblr theme creators use alternate coding methods to produce CSS themes. Because so many custom Tumblr themes exist, there are multiple ways to update a theme's CSS code.

Yahoo Inc. reached a deal to buy the popular blogging service Tumblr for $1.1 billion. Here is some background on Tumblr, where Generation Y is sharing everything from snaps of their pets to ...