[Plugin: ICS Calendar] Hover event box too far to the right

Hi everyone,

I installed this calendar and one thing I would like to change is the distance between the box that comes up when hovering over an event and the even itself. To illustrate: https://gyazo.com/7623057d30d487973b98915f778d063c.png
I’d like the box to be closer to the even itself. I looked through the custom css file but there doesn’t seem to be an element in there that controls it. Is this part of the javascript?

Any help would be appreciated. Thank you.

https://www.ads-software.com/extend/plugins/wordpress-ics-importer/