Hello,
I have visited your website. To change the background color of the sticky header you need to add the following Custom CSS in the Global Custom CSS area under Theme Settings >> Custom CSS.
body .whb-sticked .whb-row {
background: red;
}
You can set the color according to your needs.
2) You can set the header that you used on the homepage for the header of the homepage from the edit page.
Screenshot for Clarification: https://ibb.co/vVKnx3N
Then you need to set the other header as the default header from WoodMart >> Header Builder.
Screenshot for Clarification: https://ibb.co/wSd5Kyh
And you need to click star and make it default.
Best Regards.