How to connect custom data type dropdown list with styles

Hello,

 

I'm trying to create a control that allows the user to select a background style in the back office (Content Section).  If the user selects Orange, the background on a banner displays the Orange css styles, and if they select Blue, the Blue css styles.

I created a Data Type Dropdown list with the values Blue and Orange and connected it to a Property on the master page, but I have no idea how to make the styles render based on what they use chooses.

I'm usinging Umbraco 7 and developing in Visual Studio.

 

I'm not a developer so if possible please explain like i'm 5 ;)


This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/49671-how-to-connect-custom-data-type-dropdown-list-with-styles