How to change the background color of Pidgin windows

Pidgin is a very popular open source instant messenger which is available for various operating systems like Windows, Linux and Mac OS. Pidgin supports several protocols and consumes very light amount of system resources compared to bloated apps like Skype. Pidgin also does not show ads and is very stable. However, customization is not its strongest attribute. It has only basic options. In this article, I would like to share how you can change the background color of Pidgin windows.