**`sprites-var`**[`-regular`|`-solid`|`-brands`]**`.css`**
+ CSS variables `--fa`[`r`|`s`|`b`]*`-name`* are defined
for all Font Awesome Free symbols
inside `:root` and are thus available anywhere.
+ They point a `url()` to the respective symbol
in one of the three SVG files found in `/sprites/`.
+ These variables can be used by authors at will.
