how to give vertical line in html

Answer 1

You load a line image. Then you set its style like "height: 100px ; width: 2px"

Answer 2

Create a div, color it, set its height way higher than its width and voilà.

Answer 3

i think, there is no vertical line in HTLM. you need SVG for this ...https://wiki.selfhtml.org/wiki/SVG/Elemente/Pfade