// Focus state mixin @mixin focus-outline(

$width: $theme-focus-width,
$style: $theme-focus-style,
$color: $theme-focus-color,
$offset: $theme-focus-offset

) {

$width: if($width == null, $theme-focus-width, $width);
$style: if($style == null, $theme-focus-style, $style);
$color: if($color == null, $theme-focus-color, $color);
$offset: if($offset == null, $theme-focus-offset, $offset);
outline: units($width) $style color($color);
outline-offset: units($offset);

}