Hi 🙂 I've tried almost every selector known to man to get alternating grey and white 

example of one attempted line of code that should work unless I'm totally spacing: 

.wpforo-forum:nth-child(even) {
   background-color: #ffffff;
}

The page in question is here:  http://www.propelio.com/community/  

Screenshot attached of what the alternating rows should ideally look like.

Any help you can give would be appreciated.