Edit the header in Focus Mode

[LucasGA]

Is it possible to edit the css of the header bar that appears in focus mode?

I am referring to the bar that has the button 'Back to report'.

I see that it is possible to change the background of the chart, however the CSS of the header is not effected.

[zshone123]

This would be a great feature to add as it makes using Focus mode for embedded scenarios a no go.