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Hi @baxter89!
You can remove the margin on top of the header via Global Styles > Layout, as seen in the screenshot below:
To remove the margin below the header, you will want to select the group where the site’s main content is, and remove the top margin, as seen in this other screenshot:
Additionally, you can make the header full-width by removing the left and right margins and setting the group as full-width, as seen on the two screenshots below:
I hope that helps!