change font of widget title

Hello,

Thank you very much for this plugin. It’s really great.
I am using the event manager for following site e-wise.nhtv.nl

I can’t figger out how I can change the font of the eventtitle in the widget. As you can see it’s times new roman, but it should be Arial.
Do I need to put in a code in the custom ccs of my theme or should I change something in the settings of the event manager?

Thanks for your reply
Rianne

https://wordpress.org/plugins/quick-event-manager/