Functionality for a BGS style Height Gui

Hey guys i’m trying to achieve this:
HeightGui
But unfortunately i’m not that good at scripting. So does anyone know how to do this or how to make it work? I’m still learning to script so i don’t really know how to do it , Thank you.

The UI you are currently looking at is a Height GUI wich displays the height of the player, with a bottom part for 0 and 100m top part.