lilweezy on "How to change the header of category page?!"

Hi, everyone! I'm finding hard to change the header of the category pages. I have regular pages and when I click/open them the first thing that I see under the header image is the name of the page. However, this is not the case in the category pages, when I click/open them instead of what I see in a regular page here is a big black horizontal line. I want to change that line with the name of the category (page in the case), so it can be like the other (regular) pages. Hope this makes sense. I'm using Twenty Sixteen child theme. Looking forward for your tips. Thanks in advance!