Welcome to the forums, Critingz.   I am not exactly sure, I understand what it is you are trying to accomplish, because depending on the height of the window, there would actually be different parts visible, since you are not making use of any specific vh units with regard to your styling.   If all you are asking is how to trigger the ST/pin when the boxes hit the center of the window/viewport, you could just set the start to 'center center'.   If you are going for
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