CSS

css border right

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

css border left

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

css border-left

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

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