Putting or changing a background image or picture in your Tumblr theme is actually easy. However, the coding and changes to the html Tumblr theme to make it look exactly the way you want can get extremely annoying, depending on the skin you are actually using for your Tumblr layout.
For example, it may not be enough just to insert the url of your image, but you will have to edit, change or delete other background colors that could be covering your image background.
You might also be interesting in adding a scroll to top button tumblr in addition to the background picture. Let’s get started