CSS max-height property is used to set maximum height of a box element. Few points to note about max-height
- It cannot be negative.
 - If max-height is less that min-height, then min-height value overrides it.
 
CSS property max-height
| CSS version: | CSS 2.1 | 
| Value: | length | percentage | none | inherit | 
| Initial: | none | 
| Applies to: | all elements but non-replaced inline elements, table columns, and column groups | 
| Inherited: | no | 
Example – max-height pixel value
<style type="text/css">
.box {
  width:100px;
  max-height: 50px;
  overflow:auto;
  background-color: lightgreen;
}
</style>
<div class="box">
This is some text where max height will not exceed 50px
</div>Example – max-height pecentage value
<style type="text/css">
.outer {
  width: 100px;
  height:100px;
  background-color: lightgray;
}
.box {
  max-height: 50%;
  background-color: lightgreen;
  overflow:auto;
}
</style>
<div class="outer">
  <div class="box">
    This is some text where max height will not exceed 50%
  </div>
</div>