Hello, @mtoo,
Actually, there is a CSS code added in the theme options that is causing the issue I just committed the code and now your issue is resolved. Here is the image of that CSS code: https://i.is.cc/2f59CFTC.png and here is the resulting image: https://i.is.cc/2f5mkK8d.png please check back to your site after clearing the browser cache.
Regards 8Themes Team.