Heading lines for each section on homepage

The headings on your pre-built blocks have black lines on either side of them.

We are trying to achieve the same effect on the heading "we sell" that we have created manually.

Answer: 

To achieve the same effect, you need use this structure: <div class="content-heading"> <h3 class="title">WE SELL</h3> </div>

instead of <h3>WE SELL</h3>