On our Storefront demo, you may have noticed the black bar beneath the navigation that includes informational text. This is possible by adding basic HTML to a text widget placed in the Header widget region.

To recreate, add a text widget to your Header widget region and insert the following code:
<div style="text-align: center; background: #000; color: #fff; padding: .53em; font-weight: bold;"> | |
<span style="margin: 0 1em;">Check out our new Jackets!</span> | |
<span style="margin: 0 1em;">Get 25% off your first order!</span> | |
<span style="margin: 0 1em;">Free shipping on all orders over $100!</span> | |
</div> |
This can be tweaked to suit your needs.
Note: This is a Developer level doc. If you are unfamiliar with code/templates and resolving potential conflicts, select a WooExpert or Developer for assistance. We are unable to provide support for customizations under our Support Policy.