Hey @David!
I just responded to your other thread, which is also related to some CSS changes for your widgets display → https://theeventscalendar.com/support/forums/topic/change-minical-to-show-next-3-events-instead-of-3-events-in-the-selected-month/
The answer to your border-related question on this current thread here could change based on the outcome of your other thread that I linked to above – I’ll close up this thread so that we can we move all of your widget-related questions to that one thread for the sake of keeping things organized, which will help us help you faster.
Based on what works for the problem in your thread, the answer to this border question might change, but in general your use of :last-child is not far off at all. I’ll share custom code in that other thread once we sort out which “upcoming events” themselves will display.
Thank you! See you over in your other thread 🙂
— George