Streamline Theme - Add ICON to Announcement bar.

[Marvist]

Hey Shopify Community

I am trying to add a shipping icon to my announcement bar. I have tried to find anything helpful but wasn't successful.

https://barberry-fitness-apparel.myshopify.com/

PW: aoniye

The announcement bar says "Free shipping and returns" and I would like to add a couple of icons there. 

What are the steps to take?

Thanks for your attention.