Can't change background color of Bootstrap navbar

I added a navbar element inside a Bootstrap container / row / column and then went to change that navbar’s background color under the App Structure panel.

Screen Shot 2020-01-18 at 4.50.03 PM710×1228 55.7 KB

I didn’t want to use any of the predefined Bootstrap colors so I switched to the Design panel.

Screen Shot 2020-01-18 at 5.00.37 PM732×1356 72.1 KB

The problem is that Wappler doesn’t seem to be letting me change the background color of the nav element from inside the Design panel. A rollover message comes up that says that the control is overridden by a Bootstrap file.

Screen Shot 2020-01-18 at 4.50.54 PM906×970 58 KB

What am I missing? How can I change a navbar’s background color to a color of my choice without having to manually edit the markup/code in the Bootstrap file?

Thanks!