Change Sub Menu background color

Hello,

In Kilix, I would like to change background color of all Sub Menus to be "dark brown background color with text in white color".

Right now I use 2 type of Template Styles : os_kilix-home and os_kilix-inner. I need them to look the same. Please see my website at :

www.excelexperttraining.com/365/

I have changed the background of main top menu to be white already by using this code into Custom Code - before </head>.

<style type="text/css">
.t3-header {
background:#fff;
}
</style>

Thanks,
Somkiat