Sandbox Space sets footer to wrong display

The sandbox uses space key to remove the footer and have a nice view, but when pressing again it sets the style of the footer to display block instead of grid, so the buttons from the footer are not available.
You can check it in the sandbox page and it does the same in the github repo.
File: index.js line 349 - = “block”; change to “grid”

Do you mind sending a tiny PR to fix it?