
CSS doesn't natively support color blending the way that GIMP does. SCSS Blend Modes attempts to fake that by allowing you to blend a foreground color with a background color in order to approximate color blending. The process is not dynamic; you can't use it to blend a color with an image.
Sass makes CSS fun again. Sass is an extension of CSS3, adding nested rules, variables, mixins, selector inheritance, and more.