pinspacing property test
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pinSpacing:false
ScrollTrigger.create({
    trigger:".box1",    
    start:"top 600px", 
    end:"+=400", 
    markers:true,
    pin:true, 
    pinSpacing:false,
});
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pinSpacing:true (default)
ScrollTrigger.create({
    trigger:".box2",   
    start:"top 600px", 
    end:"+=400", 
    markers:true,
    pin:true, 
//    pinSpacing:false,
});
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