Issues with grid and title size

Hello!

I am testing this plug-in and I have problems with its configuration.

I think the products are not displayed as they should, for example the grid.

I use the code that the plug-in offers me:

[amazon-grid asin="B07ZQ3Z3MT,B07VCDY7B6,B07VGJ66GS" columns="3"]

But the result comes out like this:

https://i.ibb.co/qJ5sSJb/grid.png

Why can’t I get the grid? I’ve tried several but can’t.

How can I change the font size of the title?
I have tried using css and searching the forum but I have not been able to do it.

Thank you very much for your help.