It’s sometimes difficult to keep track of all the values that you are using in your design. It’s unlikely that CSS will ever include constants, so it will help to keep notes in an easy-to-reference location in your document. Creating a glossary of colors and types leads to more consistent and attractive designs  Although section headers and dividers really aren’t anything more than CSS comments, they do help organize your CSS and allow you to quickly scan your code to locate particular CSS rule groups. If you have established a TOC, I recommend reflecting that organization here. I uses asterisks to indicate a section level. All of the CSS rules starting with @ (@media, @font-face, @import) need to be placed above any other CSS in the external style or embedded style sheet. In addition to making these rules easier to find, many of them won’t work unless they’re placed at the top.