How can I add a black line under my header on Dawn that is thicker? Also add white space to banner

[funkydropshippi]

Hey guys!

How can I add a thick black line under my header - I have tried the largest amount offered by Dawn theme but it is too thin - Also I don't like that the image banner has no white space above it, how can I add some white space to my Image Banner on Dawn theme 

I think this is the same for all Shopify 2.0 themes?? 

Please help!

[HamishDavisonIC · Accepted solution]

The video:

Around line 2000 the last line of this code In base.css add:

/* section-header */
#shopify-section-header {
  z-index: 3;
  border-bottom: 5px solid black;

and then to add white space on 5th line add the final line of this code in section-image-banner.css add:

.banner {
  display: flex;
  position: relative;
  flex-direction: column;
  margin-top: 2.4rem;
}

[oscprofessional]

@funkydropshippi 
Hello,
Can You Please Share Your Store URL...

[ShopOwner28]

Can this be done for Debut? a thin line?