Images not appearing in calendar

Hi!

For some reason the images of events do not appear in the connected calendar: https://www.osalling.com/kalender-1. 

The events are loaded from here: https://www.osalling.com/events-1. 

Any suggestions as to why that is...?

Thanks in advance

Use this code to Website > Website Tools > Custom CSS

.background.background--iseventscollection {
    display: block !important;
}

.yui3-squarespacecalendar .background-image {
    width: 100% !important;
    height: auto !important;
}