Styling the Matomo opt-out iframe

hello forum!

I just updated a website and added an opt-out for Matomo in an iframe.
It works and looks OK-ish … You find it here. It is the last two paragraphs of this section.

First question: How can I style the text to look the same as the paragraphs above?
Here is the code I added in the html bric:

“border: 0; height: 280px; width: 100%;” src=“https://kanzlei-schaefer-mainz.de/matomo/index.php?module=CoreAdminHome&action=optOut&language=de&backgroundColor=575757&fontColor=ffffff& fontWeight=lighter; fontSize=&fontFamily=Merriweather-Regular” class="

It seems to take the font family and the font colour but the font weight is not right. Any ideas?

Second question: How can I change the blue colour of the checkbox to green?