Ah. I see what you guys mean. It seems like I didn’t make the question clear enough.
Let’s me explain again.
I want the sticky header staying on my website. The problem is the part of navigation. When the page is on the top, the text of navigation is bigger and at a lower position. When the page is scrolled down, the text jumps to a higher position and font size becomes smaller.
My question is how to make the text at same position and same font size when the page is on the top and also when the page is scrolled down.