How can i change background color of first column data

[Rúben Rodrigues <ruben_gr live com pt>]

Hi guys,

I have a problem with treeview. My first column of treeview where we 
have data, is yellow. I want to change to other color. How i make this 
in css? I changed the background color of column header with this code:

column-header .button{
     background-color: #5b5b5b;
     color: black;
}

But i don't know how to change first column background just in the data.

THanks