Fix wrongly-labeled colors in test.css

According to the [IM docs](http://www.imagemagick.org/script/color.php), HSL and the first 3 arguments of HSLA must be either *all* ints & floats or *all* percentages, not mixed. (Alpha channel is always 0.0-1.0, though.) This explains why the `test.css` file was displaying colors that didn't match the labels.