How To Set Border Under Each Post

[daudet]

I would like to know which property to set to have a border under each post.

 

[craigiri]

I think this is what you are looking for.....I have a 2 pixels above each - same as being below....

 

[Sylar]

Could also be a signature setting

 

[daudet]

Thanks! That did it. Things look 1000 times better.