Twitch Embed body background is white

[rvplauborg]

Hi,

On a website with darkmode, it can be quite jarring that the Twitch embed body has a white background-color, instead of it just being transparent and supporting all kinds of backgrounds. If you have styling attempting to ensure the video format (16:9 for example) you can get into situations where it cannot be calculated 100% exact which means that a pixel of the background will show on the bottom or right side. If the background color was transparent on the embed body tag I think that would support more use cases.