column line width

column-rule-width

This property sets the width of the line between columns.

Property values

Specify the width of the line between columns using any of these font-relative typographic units:

em em The font-size of the current font
rem relative em The font-size of the <html> element
ch "0" The advance measure (the width) of the current font's "0" glyph
ic ideograph count The advance measure (the width) of the current font's "水" ideograph

Or use any of these fixed size units which are independent of the current font:

in inch A size equal 96px
px pixels A size equal to 1/96 inch
pt point A size equal 1in/72 = 1.33px
pc pica A size equal 1in/6 = 12pt = 16px
cm centimeter A size equal to 96px/2.54 = 37.8px
mm millimeter A size equal to 96px/25.4 = 3.8px
Q quarter millimeter A size equal to 96px/1016 = 0.94px

Examples

column-rule-width: 1px;
column-rule-width

style > column > column-rule-widthcolumn line width

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