bullet lists font too small. no way to change it

Hi, I was able to change the main font size but the bullet lists fonts I have in my articles are not changing and the font is too small which throws an error for readibility issues in google search console. Unfortunately I ve nnot been able to find a way to increase this font in the customizer.

On top of this I get the following error in the chrome inspector :

Refused to apply style from because its MIME type (‘text/html’) is not a supported stylesheet MIME type, and strict MIME checking is enabled.

Thanks for your help