change the font size in overlay

yes, you can use css for that

Thanks Thomas.

This might sound really stupid but im a beginner and still getting my head around Word press. Would you be able to tell me how i can change the font size in Css?

Apologies and thanks in advance.

Unfortunately, I can’t give you a crash course on CSS here, but you need to figure out how to include custom CSS in your theme (either coding in the template, style.css or a custom field in the theme options).

There, you can use a line like this to make the font size smaller

isc-source-text { font-size: .8em !important; }

or larger

isc-source-text { font-size: 1.2em !important; }