Controlling the number of card columns on different breakpoints with SCSS

This recipe will involve some SCSS mixins, which will alter the behavior of the card-columns component. To be able to showcase the desired effect, we will have to have a few hundred lines of compiled HTML code. This poses an issue; how do we show all that code inside a recipe? Here, Harp partials come to the rescue! Since most of the code in this recipe is repetitive, we will make a separate file. The file will contain the code needed to make a single card. Then, we will have a div with the class of card-columns, and this div will hold 20 cards, which will, in fact, be 20 calls to the single card file in our source code before compilation. This will make it easy for us to showcase how the number of cards in this card-columns div will change, based on screen width. To see the final result, open the chapter4/complete code's app folder, and run the console (that is, bash) on it. Follow it up with the harp server command...