[Bug Report]: Background color broken (VSC-432)

[ghost]

After last update of VSCode from 1.48.2. to 1.49.0 I found that extension`s backgroung has ben broken.
Now all text almost invisible (including project configurator)

[brianignacio5]

This is probably due to some change in vscode webview css variables which we reused in the Webviews.
Will take a look thanks for posting !

[pwmb]

@brianignacio5 this is due to previously we were using background: transparent which then use to show dark background in a dark theme but now we explicitly have to tell vscode to paint the background accordingly

Will create a PR to fix this.