Another cool feature for your consideration, check out the new Borders feature in the new experimental Design Panel:
So do you like it?
Remember to enable the experimental features in the global Wappler options / system, to be able to see the new panel
I really like theses new features you are adding in the css designer. They are very intuitive. Now If I could only have split code/design window 
One problem: There is no way to manually enter a colour value for the border colours. It is near impossible to set two borders to the same colour.
Yes, very good point.
i have issues attempting to get all four sides the same with reentering the information, especially the colors. Might be easier to include a button that clearly allows for all 4 to be set at once. I find the sliders change the settings to much relying upon skill with a mouse, which I do not always have.