This is standard design with our theme, I’m afraid. To customize our theme, we use variables. This way, all buttons inherit the colors chosen in the customizer.
Could you share the URL to your website with us please? You can post it in your next reply and mark it as private to keep this between us.
Could you create a new website user for us please? In this case, administrator capabilities is not necessary. So we can make a quick check of your settings.
You can post the user name and password in your next reply and mark it as private too.
Thank you. 🙂