@wpgaijin – Can you elaborate? Our styles should not interfere with yours. Nearly every class we have is namespaced (begins with popmake-) which means that only another plugin with that prefix could clash. Also we don’t style the content of the popup beyond font family & color currently. You can also set font family to (Use your themes) inherit which it should be by default.
Other than that any content in the popup is 100% styled by your themes CSS and other plugins. If your themes styles are not being rendered in the popup then this means all of your themes styles have been set to only work inside the themes top html wrapper element. IE
<body><div id="wrapper">
</div>
<div id="popmake-123"></div>
</body>
So in this case your theme is likely only applying styles to stuff inside #wrapper. Since the popup isn’t inside that div their styles wouldn’t apply. That isn’t something we can do anything about. We have no way to detect their styles and move the popup to a place that would work. Especially considering 10,000s of themes out there.
In any case there is an option under Popup Maker -> Settings -> Assets tab to disable all styles, but that means you would need to copy parts of our core styles to your stylesheet and theme it yourself beyond that.
Hope that helps.