One way to add a background photo to any custom Tumblr theme is to embed a simple CSS tag at the right location in the theme's HTML code. Navigate to Tumblr and log in to your account.

Personalise your Safari by adding an image of your choice to have in the background of the Start page in the new Safari 14 By Karen Haslam Managing Editor, Macworld SEP 28, 2020 1:47 pm PDT ...

How to Add a Background to OpenOffice Impress. ... Untick the AutoFit box if you wish to set the dimensions of the background image yourself. Click "OK" to save your changes.