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Hi! I try animate className property. Something like below. timeline.to(vars.$morph, 3, { className: '+=morph--index-12', roundProps: 'className', }); .morph--index-1 { background-image: url("../images/animations/main-test/main-test-1.png"); background-size: cover; background-repeat: no-repeat; } Stylesheet has classes from .morpth--index-1 to .morph--index-12 But when animating - background-image property has decimal values. roundProps: "className, class, background, backgroundImage, all" - none each of them don't work.