A vendor prefixing mixin for Sass. Found it online. Sorry to whoever wrote it initially!

vendor-prefixing.scss

/**
 * This mixin is awesome. Handles vendor prefixing in a single line.
 */

@mixin vendor-prefix($name, $argument) {
  -webkit-#{$name}: $argument;
	   -moz-#{$name}: $argument;
	    -ms-#{$name}: $argument;
	     -o-#{$name}: $argument;
	        #{$name}: $argument;
}

/**
 * To use:
 */

.something {
  @include vendor-prefix(transition, 200ms ease);
}

/**
 * Which renders as:
 */

.something {
  -webkit-transition: 200ms ease;
     -moz-transition: 200ms ease;
      -ms-transition: 200ms ease;
       -o-transition: 200ms ease;
          transition: 200ms ease;
}