Hello, @atahan,
Thank you for using our theme and for contacting us.
To change the color of the “Request a Quote” button, please go to Xstore > Theme Options > Woocommerce > Single Product Builder > Request a Quote > WCAG Color and select the desired color. Once you have made your selection, please click “Publish” to save your changes.
Please refer to the attached image for your reference. https://imgur.com/SDBcNB9
If you have any additional questions or concerns, please do not hesitate to reach out to us. Our support team is always available to assist you.
Best regards,
8Theme’s Team