// vendor prefixes
// you should be using autoprefixer here but if you can't for some reason...
@mixin prefix($property, $value, $prefixes: ()) {
  @each $prefix in $prefixes {
    #{'-' + $prefix + '-' + $property}: $value;
  }
  // Output standard non-prefixed declaration
  #{$property}: $value;
}
// Example usage: @include prefix(text-size-adjust, 2, webkit ms);
// You should probably look into using:
// Autoprefixer: https://github.com/postcss/autoprefixer
// Compass: http://compass-style.org/