/* キーワード値 */
border-style: none;
border-style: hidden;
border-style: dotted;
border-style: dashed;
border-style: solid;
border-style: double;
border-style: groove;
border-style: ridge;
border-style: inset;
border-style: outset;

/* 上下 | 左右 */
border-style: dotted solid;

/* 上 | 左右 | 下 */
border-style: hidden double dashed;

/* 上 | 右 | 下 | 左 */
border-style: none solid dotted dashed;

/* グローバル値 */
border-style: inherit;
border-style: initial;
border-style: revert;
border-style: revert-layer;
border-style: unset;