To get started with the recipe, let's first get an idea of what we will make. Navigate to chapter8complete/app/ and run harp server. Then, preview the completed recipe at localhost:9000/recipe08-01. You should see a simple layout with four card components lined up horizontally.
Now, resize the browser, either by changing the browser's window width or by pressing F12 (which will open developer tools and allow you to narrow down the viewport by adjusting the size of developer tools). At a certain breakpoint (md, i.e. the medium breakpoint), you should see the cards stacked on top of one another. That is the effect that we will achieve in this recipe.
