I have a fairly novice understanding of CSS and HTML, and I\'m trying to do something that I think should be relatively simple (in a custom tumblr theme I\'m creating), but
I was was looking to show code on post pages, but not on the index, search, etc page (i.e. pages with multiple posts. Thanks to the above, I figured out how to do it and wanted to share in case it helps somebody else.
This is the content I wanted to show on the post pages only.