Maximum height
max-height
Specify the maximum height 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 height for the element. The element's height will expand up to the amount of space required to fit everything.
If that expanded height is less than the max-height property, the element's actual height is set to that expanded value (somewhere between height and max-height).
When the expanded height is more than the value specified for max-height, the element's height is capped at max-height, and the extra text is subject to the overflow-y rule, either causing a vertical 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 height:
| 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 |
Or use any of these fixed size units which are independent of the current font:
| % | percent | A percentage of the parent element's height |
| 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-height: 80%;