          scale: 1,
              opacity: 1,
              scrollTrigger: {
                trigger: ".main",
                start: "top top",
                end: "+400px",
                scrub: true,
                markers: true,
                // pin: true, // 动画执行期间，页面不进行滚动，动画执行结束后
              },
            }
          );
          gsap.fromTo(
            ".dd-text",
            {
              y: 0,
              opacity: 1,
        