Hi Christian,
the background of the content is more complex.
If you want to change the white background to black you have to change all other styles too, because you need to change the whole font colors too.
Whenever you try customizing our templates we highly recommend using Web Developer Tools like the famous Firebug plugin for Firefox. Other browsers like Chrome, Opera or Safari include very similar functionalities. Using these tools you have the possibility of easily trying out CSS styles right in your browser and inspecting existing styles to find their location in the theme's CSS files.
www.joomlaplates.com/template-customizing
We know there is a difference between what is considered technical support and customizations. We are committed to help you with any type of support query, however we can't provide extensive help in terms of customizations. In general customizations may look simple but you will require solid knowledge of web technologies and programming skills to do them or hire a professional who can do it for you.
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