Custom Coloring in Dashboards
Yeah you sort of need to get on board with the syntax and how the OS platform wants it. You can of course, get to any color you need. Adding the #FF has served as a viable option. If you use a Paint type of tool with the eyedropper you can get the coded value, then you can put it in the format that OS wants/needs.
Tip: Create Literal parameters to store the color values so you can reference them everywhere throughout your application. Just did this recently to match colors for a client, the literal parameter is a Dashboard Parameter component. This here is a very client specific color of green to match their legacy reports.

Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.