In Sass, you can use the ampersand (&) sign to reference the parent selector in the nested code. Referencing the parent can be useful to create constituted selectors from your nested code.
In this recipe, you will have to compile your SCSS into CSS code. You can use the Ruby Sass compiler to do this. More information on the Ruby Sass compiler can be found in the Installing Sass for command line usage recipe of Chapter 1, Getting Started with Sass. Alternatively, you can also use SassMeister to compile your code. SassMeister is an online compiler for Sass, Compass, and LibSass. You can read more about SassMeister in the Playing on SassMeister recipe of Chapter 2, Debugging Your Code.