CSS

The Sass .sass file is visually different from .scss file, e.g. Example.sass - sass is the older syntax

$color: red

=my-border($color)
  border: 1px solid $color

body
  background: $color
  +my-border(green)

The Sass .sass file is visually different from .scss file, e.g. Example.scss - sassy css is the new syntax as of Sass 3

$color: red;

@mixin my-border($color) {
  border: 1px solid $color;
}

body {
  background: $color;
  @include my-border(green);
}