GUI TextBlock backside, can't make it transparent

This may be a silly question but I am new to babylonjs.
Is there an easy way to make a GUI TextBox element placed on Plane to be transparent on the backside?

In this playground, the GUI TextBlock element is displayed as a mirror view. I would like it to be transparent.

Second question, how can I check if the visible GUI TextBlock page is changing from frontside to backside?

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Thank you