Rise 360: Adjust color of checkmarks

Hi,

I am creating courses in Rise360 that use a custom theme color. The color is fine and things look good - except for the checkmarks in knowledge checks. (see screenshot - the faint contrast between the white background and the yellowish checkmark really isn't very good) The customer asks for a change and I told him that I can't influence the color of the checkmarks as it is generated automatically based on the theme color - and we would like to keep that.

But I'm thinking that maybe there is a trick to adjust the color of the checkmarks without touching the theme color? Does anyone know a workaround? Maybe the color could be adjusted in the CSS-File after the HTML-course has been published? Or is there any other solution?

Kind regards,

Frank