In a FileMaker solution I have a custom theme. Now I want to modify the styling of a tab-panel (not tab-control). As far as I can see, this is only possible in the CSS file directly (inspector has no options for it - you can not even select it). As the custom style is embedded in the FileMaker solution file, how can I modify the CSS of such a custom theme?
Any help would be appreciated as I do not want to copy/paste an existing default theme and then reapply all the style changes I did so far ... just to change a color in a tab-panel