Hi Anne 🙂
Sorry to hear about the display troubles. Theme customizations are typically outside the scope we are able to provide through our support forums, but take a look at this article. It might help with the mini calendar responsiveness.
One other idea I have would be to open “Inspect” by right-clicking on your mouse when viewing your homepage. Try identifying the CSS class your theme is using. You can test CSS right there in your browser. Lastly, you could try contacting your theme author to see if they can provide any assistance.
I hope this information helps and best of luck with the customizations. Thanks for choosing PRO and have a great week 🙂