Newest compass requires "css3" folder instead of "CSS3"

Just a quick heads up to anyone who might be struggling with this, if you are trying to make sass changes and compile them you might see an error like "File to import not found or unreadable: compass/CSS3". You might get their error even if you've installed compass/CSS3 mixins and the paths appear to be correct. It turns out the latest compass doesn't get along with uppercase folder paths. The solution is to rename CSS3 folder to css3 and change the line in global.scss from @import "compass/CSS3"; to @import "compass/css3";. Hope this saves someone some grief! More info here: https://www.drupal.org/project/drupal8_parallax_theme/issues/2854758