Parallax effect to be incorporated to a webpage

1. Please check this link – https://goofy-wiles-1307ac.netlify.app/
2. There are 3 sections in the whole page where we are trying to incorporate parallax effect.
3. In the top banner, below where you see multiple dots and further down where you see the Indian map.
4. The issue we’re facing is that the parallax effect is not as smooth in the 2nd and the 3rd section and most of the image is hidden under the top and bottom sections.
5. The parallax effect (including the top banner) is flickering when viewed on mobile.