css border left

1.rightBorder {
2  /*          width style color  */
3  border-right: 5px solid black;
4}

1.leftBorder {
2  /*           width style color  */
3  border-left: 5px solid black;
4}

1Container(
2  decoration: BoxDecoration(
3  	border: Border(
4  		left: BorderSide(color: mainColor, width: 3),
5  	),
6  ),
7),

1p {
2  border-left: 10px inset green;
3}
4
5h1 {
6  border-left: 15px solid blue;
7}