Documentation - Zero to thunder rendered as white font on white background

[mjmikulski]

🐛 Bug

Part of the documentation (outputs of computation cells) is invisible.

To Reproduce

Steps to reproduce the behavior:

1. Open Zero to thunder tutorial
2. Try to read outputs of cells.

Expected behavior

Outputs are visible.

Workaround

Refreshing a page a few times sometimes fixes the issue.

Environment

• OS (e.g., Linux): MacOS
• Browser: Chrome, Opera, Safari (I was able to reproduce the issue in these 3 browsers)

Additional context

Screenshot: on the left the text is invisible, on the right it is visible.

cc @Borda @apaz-cli

[IvanYashchuk]

@lantiga, could you please find someone to fix it?