Formatting Section Containing Background Video

I have a section where the only thing in it is a background video. It’s in it’s own section because I want the background of the video to be black, however I can’t figure out how to get the section it’s in to resize appropriately so that it contains the background video in the center. I’ve applied padding to the section but the background video only seems to respond to the top and side padding values and still hangs off the bottom the section.

Could someone explain why this element behaves this way and let me know if there are any ways to work around it?

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