Here be a sample post with a custom background image. To utilize this “feature” just add the following YAML to a post’s front matter.
This little bit of YAML makes the assumption that your background image asset is in the
folder. If you place it somewhere else or are hotlinking from the web, just include the full http(s):// URL. Either way you should have a background image that is tiled.
If you want to set a background image for the entire site just add
and BOOM — background images on every page!