Hello, @Oliver Theiß,
1. Your issue is resolved now, kindly check back to your site after clearing the browser cache. Check this image to know how I solve your issue:https://postimg.cc/0MxjbB48 and now here is the resulting image: https://postimg.cc/Lhx58v3p
2.. Issue resolved now, Kindly check back to your site after clearing the browser cache. I solve your issue with the help of custom CSS code in the theme options check image:https://postimg.cc/Wdk0Zx5r and here is the resulting image: https://postimg.cc/SXG274CX
Regards 8Themes Team.