Hi,
The container border css of the events calendar module will not work If one page have events calendar module and also have one third party control (eg. aspxtitleindex, using default Css), events calendar also use default css. But all of other module container works good. please reference to the attachment.

Apple,

We only use the default.css from the /desktopmodules/eventscalendar/scripts/ folder.

We don't use the portal default.css.

Could it be the width of the module? as the calendar requires a minimum width to render properly. Trying move it to a bigger pane?

Thanks.
We also try to change the width of the panel and container to 300px~700px, but the result is the same as before.
From the pic we can see it is no problem of the module latest events that also use "Events calendar Satellite" Module.
So, I think maybe the css of the small calendar conflict with the css of third party. But I am also not sure.

we have tried to change the css of the third party control, but still not work.
please help us analyze this problem again and give us more test advice is also ok. thank you very much.

You can view HTML source to find out:

what are the css files are loaded for that page.

If you remove that 3rd party control, will it resolve the problem? if so, the conflict maybe from that 3rd party control using some css class.