Corrected an example in file example-usage.lisp
Corrected an example in file example-usage.lisp

There was an example that was using the css-variable
my-macroed-css-var.

It was replaced with my-favorite-border-var.

Also, that same example was missing a call to the function css, which
was added.

paddymul/css-lite,quasiquoting/css-lite