Expound theme – removing author name

Hi all,

I am using the Expound theme and have created a child theme that seems to work fine. I would like to remove the author attribution for all posts. Based on this thread:

I added the suggested code: .entry-meta .author { display: none; }

to style.css in my child template. However, I still see the author name visible on my posts.
I searched through the parent theme and noticed that the recommended code is in Expound.css, which the parent theme imports. But I am sure that I should not edit the file in the original CSS.

The website in question is:
Is there something else I need to do to make this modification to my child template?
thanks so much for the help.