Insert separation line between header and page

Replies: 0

Hi,

I would like to add a coloured line between my header and all of my pages. It only needs to be 5px thick, but needs to display the full width of the page.

The problem I am having is that I am using a white background header, with white pages. It looks fine on the home page, but I think it would look much better with a divisive line in colour #26C0AE, especially for the other pages. My page is dr-holly.com.au

Can I do this with CSS? If so, can you help, as I understand that this is not necessarily a theme problem. Any help would really be appreciated.

Thanks,
Steve