13. In the large desktop media query, below the last style rule, add the following style rules:
a. Add a style rule for the grid class selector that sets the grid template columns to a four-column layout.
b. Add a style rule for the aside element that sets the grid column value to 1 / span 4, and set the font size to 3em.
14. Add the following link elements within the head element on all of the HTML files, including the template.html file: