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Where's The Header?

Hi there,
I would like to make a simple image header for the website I am designing.
I would like that header to contain an image, and I want the navigation bar to sit transparent ontop of that image. Furthermore, I would like to crop the header and in turn that header will crop/cut off the image, not resize it like a container or div block does.
When using a free Webflow template, I see in that the template is using an element called Header, but I cannot find this element anywhere on Webflow, or any videos about it. I would use a Slider element to create what I want, but I want the image to remain static. Below I have attached an image of what I would like accomplished so you all know what I mean.
I hope to hear back from someone regarding this. Cheers!

Here is my site Read-Only: LINK
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