const tween = gsap.to("#menu-menu-gradient-test li", {
    backgroundImage:
        "linear-gradient(90deg, var(--left) 0%, var(--left) 100%, var(--right) 100%)",
    duration: 0.5,
    ease: "power1",
    stagger: {
        each: 0.1,
        ease: "power2.out"
    }, 
    delay: 0.5
});