refactor signin code
Refactor sign-in form
Merge branch 'mobile_styles' of https://github.com/yassomic/hackathon2 into mobile_styles

Merge needed to keep the branch to keep the tip of the local branch up-to-date
Merge branch 'mobile_styles'

It is necessary to merge the updated mobile_styles branch to have the updated sign-in form
Adjust height on the product pages