Simply set the property backgroundColor with an rgba() value. RGBA means RGB (red, green, blue) + Alpha where you set the opacity.

If you want it to be invisible, set it to 0, else 1. If you want it to be semi transparent then set values between 0 and 1.

This is an example on how to set the background of a Surface to transparent.

And this is how to set it back to normal.

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