text-shadowで袋文字（アウトライン）を作る関数

outlined-text.scss

/// Outlined text shadow
///
/// @author    Logue <logue@hotmail.co.jp>
/// @version   1.0.0
/// @copyright 2020 Masashi Yoshikawa <https://logue.dev/> All rights reserved.
/// @license   MIT
///
/// @example
///   text-shadow: outline(black, 1px, 1px);
///
/// @param $color 色
/// @param $width 線の太さ
/// @param $blur ぼかし
/// 
/// @return text-shadow

@function outline($color, $width, $blur) {
  @return $width $width $blur $color, -$width $width $blur $color,
    $width -$width $blur $color, -$width -$width $blur $color,
    $width 0px $blur $color, 0px $width $blur $color, -$width 0px $blur $color,
    0px -$width $blur $color;
}