Actually, you have set the wrong CSS for that element on your site, you have to find and remove that CSS from the CSS code shown in this screenshot: https://ibb.co/w7wtSym and it will solve your issue: https://ibb.co/Lg757Fg you will find that CSS code under Theme Settings >> Theme Custom CSS.
Otherwise, please share your site WP Admin URL and Credentials with me here in the private content area of this topic, so that I will check and help you out.
Regards 8Themes Team.
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