Oh thank you. When you think about animation.pause(), it becomes more understandable. What I really wanted was toggleActions: "play reverse play reverse"
gsap.to('.container', {
backgroundColor: '#fff',
duration: 1,
scrollTrigger: {
trigger: '.wht',
start: "top center",
end: "bottom center",
toggleActions: "play reverse play reverse",
markers: true,
}
})