I structured the talk so that I could easily go from start to finish in stages. In the PowerPoint deck you'll see I have actual git checkout commands that reference the various commits. This will enable you to roll forward to each step after you've cloned the repository. The result is a responsive health calculator app that scales well to a variety of page sizes, has built-in validations for inputs and provides you with basal metabolic rate (BMR), body mass index (BMI), and target heart rate zones (THR). The app was developed using a test-driven (TDD) approach with a total of 83 specifications. The GitHub repository has full source and instructions.
Here is the deck. I hope you enjoy!