What is the Extra CSS Attribute Code for this?

[Scott X]

There is some code you put in the extra css attributes box next to first and second alternating color, and i cannot remember what it is, but it makes the lines on the forum categories etc more of a 3D look like this If you could tell me that would be great. Also the current background color for 1st alternating is #363636 and for 2nd it's #272727 so if you know the correct colors to put in the code to achieve the effect in the picture, PLEASE tell me. Much appreciated, Thanks!