css looks broken

[stxn]

Tried to add the Events plugin from the Admin to a vanilla Grav install, but the result (right on the screenshot) looks broken, compared to what is on the demo page (on the left).
It looks like a whole set of css-rules does not get applied (missing references to the stylesheet?). The only thing I detect that is different: in the demo, there is a section.calender-table around the table.calendar element.
Any idea if I might have done something wrong?

[l3aconator]

Antimatter probably has written custom CSS for the calendar. I rewrote the template and css for it in my site install because the calendar isn't responsive so I turned it into flexbox.

[mrichar1]

Antimatter probably has written custom CSS for the calendar. I rewrote the template and css for it in my site install because the calendar isn't responsive so I turned it into flexbox.

Just looking at grav and event plugin and first thing I find is this layout bug. Do you have that updated layout available to share?