Enhancement - Custom CSS support in themes

[apoapostolov]

The need for additional CSS is to resolve conflicts with specific elements in the UI, such as parts of the UI using the wrong colors or needing to be hardcoded to specific color from the theme palette or a custom color.

[apoapostolov]

The way I imagine this, in order to be theme maker friendly, would work as follows:

In a new tab, user can create and delete unlimited entries. Each entry consists of:

• text field for CSS class and a dropdown - either enter your own classes or choose from a dropdown of all classes in Foundry UX
• dropdown with all the basic CSS operators related to theming - font color, background color, margin color, etc.
• a dropdown to select color from the palette or to choose a custom one