Hi Nasser,
I found small problem. Using latest tex4ht, the borders now
> all becomes gray OK as expected. But when adding
>
> \usepackage{booktabs}
>
> They go back to black again. in PDF they remain gray.
>
> It looks like something in booktabs package overrides your fix.
>You are right; Booktabs override the \hline color defined in your preamble. I've fixed it in the sources. Best, Michal
