site title's font and size is different in the main header and sticky header

I am using navigation as the header and I have added the site title to the sticky header. The site title's font, font size, and color are different in the main header and sticky header. I like the sticky header's font, font size and color but I do not know where it is controlled. Can you please let me know how I can make my site title in the main header look like the site title in the sticky header? thank you