In the #css-themes channel @mdbraber asked:
Is it possible to color the text of a whole line with a specific #tag in it (instead of just coloring the tag?)
@Steve_yang provided code for this:
Steve allowed me to add it to the repository. You can find it in the chapter Sentences, section # Combine Nested tag colors and Highlight colors.
Github repository page link is given in the OP at the top of this page.
Enjoy.