Thank you so much Sir! but it seems not working. I'm totally new to the GSAP, thank you again for your great patience! I just updated my codepen.io code, you can see all the code directly this time! My problem is when I trigger 'content 3' , the start/end button will detect the content3 position automatically, it works in codepen.io, but doesn't work on my visual studio, the same code will look like this on my laptop
they are just overlapping and positioned on the top of the screen. Why does this happen? and if I trigger 'content3', all the content3 will become invisible until i refresh and resize the screen. Thank you so much for helping!
