border-opacity.scss

// Opacity should be on a 100 point scale (0-100 instead of 0.0-1.0)
// This should be used to supplement a normal border definition as it
// only deals with the 'border-color' property.
@mixin border-opacity($color, $opacity) {
	$opacity: $opacity / 100;

	// Unsupporting browsers get this
	border-color: $color;

	// Browsers that support RGBA will get this instead
	border-color: rgba($color, $opacity);

	// Prevent the element's background from reaching the edge of the border
	-moz-background-clip: padding;
	-webkit-background-clip: padding;
	background-clip: padding-box;
}