add background color to position right

How would I add a background color to the right layout position so that when 2 or more modules are loaded in that position i do not see the white space between the modules.

example can be seen here
greenlizzard.byethost6.com/index.php/reg...ers-and-assoc/europe

Many Tahnks

For every position you have css class:

.mp_<postion name>{
...
}

to color just single module you module class suffix you have that in every module setting.
Set suffix for example : " my_modyle_style1" then in css you can use:

.my_modyle_style1{
...
}

You can add this css at bottom of template_css.css