Please prove the whole currently code which has following the introduction blew by typed, thank you very much!

Introduction:"

Design a mobile-scale form that uses only shades of gray (no solid borders) for the input regions and with CSS that including its baseline grid and typographic (modular) scale, and favor an open design with plenty of padding and white space.

Then, set up the font-family with a robust font stack made up of commonly available system fonts."