Gutters

column-gap

This property specifies the width of the gutters between columns in grids, flexboxes, and multi-column layouts.

Property values

Specify the width of gutters between columns in grids, flexboxes, and multi-column layouts.

Specify a percentage of the total width, or use any of these font-relative typographic units:

% percentage A percentage of the total width
em em The font-size of the current font
rem relative em The font-size of the <html> element
lh line height The line-height of the current font
rlh relative line height The line-height of the <html> element
cap cap height The nominal height of the current font's capital letters
ex "x" The height of the current font's "x" glyph
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 these viewport-percentage units which account for different display device capabilities:

vh viewport height 1% of the viewport's height
vw viewport width 1% of the viewport's width
vi viewport inline axis 1% of the viewport's inline axis
vb viewport block axis 1% of the viewport's block axis
vmin viewport minimum Either vh or vw, whichever is smaller
vmax viewport maximum Either vh or vw, whichever is larger

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

.multi-column {            
column-count: 2;
column-gap: 1rem;
}
Multi-column column-gap
.grid {            
display: grid;
grid-template-columns: repeat(2, 15rem);
column-gap: 1rem;
}
Grid column-gap
.flexbox {            
display: flex;
column-gap: 1rem;
}
Flexbox column-gap

style > column > column-gapGutters

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