Need help to achieve a mask reveal from centre on scroll effect

Hi Guys,

I am trying to achieve this animation of mask reveal on awwards but unable to do so. Can you guys please guide me how to do it?

Link - Scrolling masked photo gallery - Awwwards

Hello @Rahul_Ahuja, you got to use position sticky. Built a really tall section with a container sticked to the top and animate it as it scrolls through the section. I hope this helps!