Dark Code Coloring based on Notepad++ Twilight theme
Currently supported file types: Text, basic XML, HTML, CSS, JS, PHP
Back up your current Colors.xml file, and drop the new one in its place. The file is located here:
C:\Users[username]\AppData\Roaming\Adobe\Dreamweaver CS6\en_US\Configuration\CodeColoring
Restart Dreamweaver
Change your default code background color in the Dreamweaver Preferences:
Edit > Preferences > Code Coloring
Enter #141414 in the box next to "Default background"
Click OK