What would be the best technique to create a 2.39:1 ratio mark on the display of my camera?

Question

I have a Canon 60D camera which display I need to mark a ratio of 2.39:1 on. Basically, I need this to know the safe area of video when recording.

I thought about taping those two lines over on the LCD with a very soft and thin tape, but I hoped someone could get a better idea.

Thanks!

Answer

Draw the desired shape on an adhesive LCD protector and stick that on.

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