Please add the option to add borders/box-shadows to the poppers produced by a Widget Controller. If I place a Bookmark Widget in a Widget Controller it can be basically impossible to distinguish the edge of the widget from the rest of the map. See picture below.
![JeffreyThompson2_0-1695395420929.png JeffreyThompson2_0-1695395420929.png](https://community.esri.com/t5/image/serverpage/image-id/81386iB189C44E620CC2E7/image-size/medium?v=v2&px=400)
With a little CSS, the distinction becomes clear.
![JeffreyThompson2_1-1695395572263.png JeffreyThompson2_1-1695395572263.png](https://community.esri.com/t5/image/serverpage/image-id/81388iDC18FAA54DC586B4/image-size/medium?v=v2&px=400)
It looks nice on other widgets too and it would be good to give this level of control to users without developer edition. Changing the styling in the Widget Controller settings only changes the rectangle around the Widget Controller, which isn't very useful.