Removing default caption background?

Help! I’m trying to remove the semitransparent background behind the caption using the procedure outlined here:

https://soliloquywp.com/docs/remove-the-default-caption-background/

and it isn’t working. I just updated the plugin and I’m using wp 4.1.1. (Development is local so no link, but I’m talking about a common feature)

Any ideas? Thanks in advance!

https://wordpress.org/plugins/soliloquy-lite/