How to hide poster name in all places in the Shutter theme for Blogger?

Just the reference thread:
And the theme was found here: 52 Best Free Responsive Blogger Templates 2020 - Colorlib
I do realize it’s not a wordpress theme but since I found it from it’s original source, I come for help from it’s original source.
I don’t want the poster name to show anywhere on the blog. How can this be done using CSS?

Hello there,

I hope you are doing well today.

You can try using the following CSS to remove the author information:

.post-author {
    display: none;

Please be aware that we would not be responsible for themes that were not created by us.

Best Regards,