> Source URL: /users/emily-kate-s/week-4.path --- week: 4 date: 2026-04-01 --- # Emily Kate: Week 4: Build Your Caffeine Calculator Your v0 prototype shows what **CaffeineCheck** should feel like: https://v0.app/chat/caffeine-intake-calculator-vre4443Hsz3?ref=5KYOA7 v0 uses React/Next.js -- great for a demo, harder to change line by line as a beginner. This week you rebuild the **core flow** in **Flask**: home, calculator form, and a result page with real math. **Important:** Your first Flask version may look different from v0. That is intentional. You own the Python. We improve the design week by week. This guide uses **Tailwind CSS** via CDN so you get a clean layout without pasting huge `