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CSS CSS Transitions and Transforms Adding 3D Effects with CSS 3-Dimensional Rotations with rotateZ() and rotate3d()

Is there a reason why my rotating `div`(s) have a blinking effect to them as they rotate?

As they rotate, it seems as if there is a bug or glitch with the blinking. It blinks back and forth between the side-a and side-b pictures. So, it starts off on side-a, then when you hover over it, it blinks between side-a and side-b. Then it ends up on side-a again, when it should end up on side-b until you move off of the hover state. This also happens when I downloaded the project files and tried it from there.