XF 2.1 Different Background Color on every second posts (worked with 1.5)

[Hoerspiel]

Hi,

anyone have an idea about this? In my custom style on 1.5, every seccond postings had a little different color. I think, its better for reading and seperating with the eye.
But i have no idea how to do that in XF 2.1. This picture is from my actual XF1.5 installation (i am planning to upgrade and try things on my XF2.1 test installation).

Anyone have an idea?

 

[hemant_bhardwaj]

.block--messages .message:nth-child(even) {background-color: #f2f2f0 !important;}

this might help you put it in the extra.less