Hello, @Faisal,
1- In order to know how to solve the issue please watch this video: https://streamable.com/22w7nb
2- I have added a custom CSS Code in the Theme Options, check the image: https://postimg.cc/fty2PmpT by adding this code your issue is resolved here is the resulting image: https://postimg.cc/0KbNrW3R
3- Please read and follow this topic: https://www.8theme.com/topic/how-to-create-custom-tab/
Regards 8Themes Team.