How to build a custom grid with SASS

The text discusses the creation of a custom grid system using HTML5, SASS, and the CSS float property, emphasizing the advantages of grid systems in making responsive and mobile-friendly web designs. It details the setup process, including the use of SASS for cleaner code with features like nesting and the parent selector, and outlines steps for building and styling the grid. Key techniques include setting up a workflow to use responsive units, employing the CSS calc() function for width calculations, and using pseudo-selectors to avoid styling the last elements in rows. The guide emphasizes the importance of grid systems in web design while demonstrating the use of advanced CSS and SCSS features to build a maintainable and flexible grid layout.