CSS box-sizing Property
Example
#example1 {
box-sizing: content-box;
width: 300px;
height: 100px;
padding: 30px;
border: 10px solid red;
}
#example2 {
box-sizing: border-box;
width: 300px;
height: 100px;
padding: 30px;
border: 10px solid red;
}Hello World!
Meaning
The box-sizing property sets how the total width and height of an element is calculated.
learn more about box sizing in CSS Box Sizing chapter.
| Default value: | content-box |
| Inherited: | No |
| Animatable: | No |
| Version: | CSS3 |
| JavaScript syntax: | |
Standard Syntax
box-sizing: content-box|border-box|initial|inherit|revert|revert-layer|unset;Browser Support
The numbers in the table specify the first browser version that fully supports the property.
Status
Property Values
The following table describes the values of this property.
| Value | Description |
|---|---|
| content-box | Default. The width and height properties (and min/max properties) includes only the content (ie. Border and padding are not included). |
| border-box | The width and height properties (and min/max properties) includes content, padding and border. |
| initial | Sets this property to its default value. |
| inherit | If specified, the associated element takes the computed value of its parent element animation-delay property. |
| revert | Reverts the cascaded value of the property from its current value to the value the property |
| revert-layer | Rollback styles to the ones specified in previous cascade layers. |
| unset | Resets a property to its inherited value if the property naturally inherits from its parent, and to its initial value if not. |
Default CSS Property Values
selectors {
box-sizing: content-box;
}More Example
The following example will set box-sizing: border-box; to all elements using universal selector:
Example
* {
box-sizing: border-box;
}
h2, p, div {
width: 300px;
height: 100px;
padding: 30px;
border: 4px solid red;
}