## Surface

The Surface component is a `<div>` element with a `u-surface` utility class to style such element
as a surface. It is largely based upon Google Material, and has various levels of elevation.

As default it uses `u-surface--l0` which will essentially give you zero elevation, right up to
`u-surface--l5` which will give you the maximum elevation allowed.

You could use this as a wrapper for an element that you want to raise off the page to give it
some realism.

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