Background color in embedded projects

The background of app now somehow matches the editor’s color in community page instead of being white, it’s happening in every project.

Not only in community, you can see the embed on a new tab and it’s still broken :

another example :

Thanks, we have a bug report open for this already and hope to have it fixed up shortly.

The problem comes form https://glitch.com/embed/themes/cosmos.version.cd190e6930c2ea95b7a3be4c49968bd3.css:

.embed-preview iframe {
    ...
    background-color: transparent;
} 

it should be set to white
this file is generated but i couldn’t find it’s origin in the community site