Cassette Nest Mobile Prototype

I've already built out most of the functionality of this app (a way for photographers to track their use of film in analog cameras), but now I'm trying to make it actually usable by building out some prototypes on CodePen. Using React to build out quick UI components is pretty fun. In the actual app, I'm not yet using any JS--I'm building out 100% of the functionality on the server side first.