Styling: Added CSS to form

[natalialuzuriaga]

Problem

Some custom CSS is needed to style the form

Solution

Created styles.css which contain CSS for entire form. Added margins to start off

Result

Form has margins. With a CSS file, we can add more styling.

Test Plan

1. Start up a HTTP server using python: python3 -m http.server 8000
2. Here is the form! Right click -> Inspect to open dev tools
3. Fill out the form
4. Click submit and downloads code.json. File contents should match what was submitted in the form!

or try it here after merged:
https://dsacms.github.io/codejson-generator

[natalialuzuriaga]

@sachin-panayil once this is merged, form is all good for user testing now!!

[sachin-panayil]

🚢