Add position: absolute to .vh

[tsmd]

It seems that the .vh class, which is used to visually hide content while still being accessible to assistive technologies, also requires a position: absolute style declaration.

If it is not positioned absolutely, the 1px square box will continue to remain, and the style will be unintentionally broken.

Scott O'Hara's “Inclusively Hidden” also includes position: absolute.
https://www.scottohara.me/blog/2017/04/14/inclusively-hidden.html

I've prepared an example to show the contrast.
https://codepen.io/tsmd/pen/VwJBrGa?editors=1100

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