Column
This sets the width of the rule.
Its options are:
(1) Thin: This displays a thin rule.
(2) Medium: This displays a medium rule.
(3) Thick: This displays a thick rule
(4) Length: Allows you to manually set the width.
For maximum browser support, you should use the following prefixes:
(1) column-rule-width:
(2) -moz-column-rule-width:
(3) -webkit-column-rule-width: