In this page you can see some demos, the two demos in center have 2 line of custom CSS like:
border-top: 1px solid #FFFFFF !important; border-bottom: 1px solid #FFFFFF !important;
You can set also here the type of open event, for example a lightbox, you can see this in right demo, this demo has been also inserted into a small width container so it automatically show one event at same time.
This demo contain 3 lines of custom css:
border-top: 1px solid #E8E8E8 !important;
border-bottom: 1px solid #CBCBCB !important;
border-right: 1px solid #E5E5E5 !important;