Defines the maximum width the element can be.
default
max-width: none;
The element has no limit in terms of width.
max-width: 2000px;
You can use numeric values like pixels, (r)em, percentages...
If the maximum width is larger than the element's actual width, the max width has no effect.
max-width: 150px;
If the content does not fit within the maximum width, it will automatically change the height of the element to accomodate for the wrapping of the content.