Thanks,
but they are done this in different way.(moving the svg image to (-)top while scroll the page) See the codepen
using : transform: matrix(1, 0, 0, 1, 0, -1845);
https://codepen.io/tijosfx/pen/RwNBJxW
How to increase the transform: matrix(1, 0, 0, 1, 0, -1845); value(in red) while page scroll?
Thanks