Reference files for the live-coding demos, in teaching order. Open any example and use View Source (right-click → View Page Source) to read the code — then rebuild it yourself.
▶ Open the Interactive SlidesBootstrap 12-column grid with responsive breakpoints
Buttons, cards, alerts, badges, and modals
Spacing, colors, display, and flex utilities
Complete responsive landing page example
Tip: don't copy-paste. Type the code yourself, break it on purpose, then fix it. Use DevTools (F12) to inspect what's happening.