Black Background & Foreground do not match

[Ayplow]

• [x] I am on the latest Hyper.app version
• [x] I have searched the issues of this repo and believe that this is not a duplicate

• OS version and name: Windows 10 17746
• Hyper.app version: 2.0.0
• Link of a Gist with the contents of your .hyper.js: .hyper.js
• Relevant information from devtools (CMD+ALT+I on macOS, CTRL+SHIFT+I elsewhere): N/A
• The issue is reproducible in vanilla Hyper.app: Is Vanilla

Issue

It seems hyper is displaying all black background as transparent, ignoring whether is intended or not. For example in this image, the color behind the username should match the black of the arrow: (zsh:oh-my-zsh:agnoster)

I'm not sure if this is fixable as it seems both powershell & cmd fill their windows with a 'default' color, but perhaps we could switch the background color to a less commonly used color than black?

(This seems badly written, but I'm not sure how to explain - just ask about anything I haven't made clear)

[jcklpe]

Hey @TomSputz Would you happen to have an idea how I could get a transparent background on purpose? https://github.com/zeit/hyper/issues/3267