inline break not working

Hello!

i am trying to add in CSS a line break after the title of the calendar entry that is provided by the Simple Calendar widget on Wordpress.

The page is: https://www.lasmarikarmen.com

Inspecting the element "festa alternativa sants" in Opera, i see that the class name is "simcal-event-title".

In Wordpress's Additional CSS, i have added:

.simcal-event-title:after {
content: '/a;
white-space: pre;
}

However, that does not add a line break.

Any suggestions?

Thanks!