custom border left size css code example

Example 1: container border left

Container(
  decoration: BoxDecoration(
  	border: Border(
  		left: BorderSide(color: mainColor, width: 3),
  	),
  ),
),

Example 2: css border-left

p {
  border-left: 10px inset green;
}

h1 {
  border-left: 15px solid blue;
}