Maximum width

max-width

Specify the maximum width for elements that automatically change their size.

Property values

This value will be used when the text of an element is so long that it doesn't completely fit within the normal width for the element. The element's width will expand up to the amount of space required to fit everything.

If that expanded width is less than the max-width property, the element's actual width is set to that expanded value (somewhere between width and max-width).

When the expanded width is more than the value specified for max-width, the element's width is capped at max-width, and the extra text is subject to the overflow-x rule, either causing a horizontal scrollbar to appear or causing the overflowed text to be hidden.

Units

Use any of these font-relative typographic units to set the element's maximum width:

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:

% percent A percentage of the parent element's width
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

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

Examples

max-width: 80%;
max-width

style > sizing > max-widthMaximum width

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