Unable to remove Border/Dividers or to Increase padding to show full text

Hello and thank you for this wonderful plugin.
I just started learning about the use of CSS and plugins.
I have tried to identify code I need to change to increase padding or to totally eliminate vertical borders/dividers between author information column and post content, since as you can see, vertical gray divider/line, partially hides the first letter of every post no matter the font size I use, and I was not able to find a way to do this through the plugin settings.

Any support or orientation would be much appreciated.
(Forum is private, this is why I have not provided its URL)

Thank you in advance.

The page I need help with: [log in to see the link]