Hey sadmansh and welcome.   Grid properties are not directly animatable. To animate between them, you must save their visual state before the change (width, height, absolute position with regards to the viewport), make the change to the properties, then animate from the saved values to the new values. This sort of transition commonly is called the FLIP technique.   GSAP has a handy helper function for FLIP which might be able to help: https://greensock.com/docs/v3/HelperFunct
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