1. In the Customizer > Colors > Primary Navigation – set the colors you want for the Sticky Nav.
2. Dashboard > Appearance > Elements > Add New Header
3. Go to the Site Header Tab. Select Merged
4. Set the Offset Site Header to 77px (the height of your nav).
5. Then select the Navigation Colors and change the colors for the Primary Nav.
6. Display Rules – Set for the Entire Site.