html/CSS font-size and contrast accesible barrier free course

Hello team,

We’re dealing with a problem in our app, built with Articulate Storyline. We want the user to change the app font-size from a configuration menu we’ve previously built. Is there any way to set global variables in Storyline that might help us with this?
We’ve tried incrementing the font-size with JavaScript and CSS, but all the letters in the text overlap (except the text in the caption box, which seems to be the only one that’s properly working).
A similar problem appears when we try to apply different themes to the app (we call them contrasts). Is there a way we can set global variables such as primary color, secondary color, font sizes, etc. and use them in all slides?
Thank you in advance,


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