Atomic Calendar Revive

Hello,

I’m playing with Atomic Calendar Revive.
I set it up interfacing it with google calendar and I’m trying to customize it as I like.

I’d like to reach a result like this:

I’m trying to do this, but I’m going mad because I have the defualt blue grid around month and year, and I’d like deleting the grid around the week days name and set them in bold, in order to get the same as the picture.

How could I do?

PS: if someone has the code to get the entire calendar as the first picture, I’m glad to use it.