gsap.to(header,{
scrollTrigger:{
trigger: ".dark",
start: "top 80%",
end: "bottom 20",
toggleActions: "play reverse play reverse",
markers: true,
toggleClass: "dark-mode"
},
// '-webkit-filter':'invert(100%)',
// filter: 'invert(100%)'
});
You need to use it this way. It is a Syntax issue.