One of the benefits of Event Calendar App is that it embeds itself directly onto your site. There’s no ‘iframe’ between you and the widget and it behaves just like a native part of your site.
This has the huge advantage that you can style it to look however you like. However, the downside is that it is possible that you have CSS styles that conflict with the calendar widget. We try to avoid this happening as much as possible, however it is still a possibility.
If you think this has happened on your site, then please get in touch and we have help you fix the issue.