I have an excel file table where I froze the panes at cell B2 thus leaving Row1 and Column1 always in sight while scrolling the page either downwards or sidewise.

I saved it as an HTML file format to be able to publish it online. In HTML format, the panes are not frozen and Row1 and Column1 disappear from the screen when scrolling.

Can anyone please explain to me in simple terms (because I am not an
expert in html) what should I do and how to proceed to have Row1 and
Column1 kept frozen in the html file while scrolling the html file online ?

Thank you very very much for your invaluable help and response.