This example demonstrates how Sass preprocessing turns SCSS source code into standard CSS, using the SassMeister.com web tool. The input SCSS defines a `solidblock` mixin that mixes a background color with white at 40%, then applies it to `.block` and `.block-blue` classes, resulting in rendered HTML blocks with gray and white backgrounds. The snippet also shows nested selectors with a hover pseudo-class and a `$primary-color` variable. The CSS output and rendered HTML are displayed alongside the original SCSS and HTML files, illustrating the compilation pipeline from gist-embedded input to final styled output.