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# Box-sizing
The `box-sizing` style determines how the width and height of a widget are calculated.
## Syntax
```
box-sizing: border-box | content-box;
```
### Values
| Value | Description |
|------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `border-box` (default) | Padding and border are included in the width and height. If you add padding and/or border the widget will not change in size, but you will have less space for content. |
| `content-box` | Padding and border will increase the size of the widget, leaving the content area unaffected. |
## Example
Both widgets in this example have the same height (5).
The top widget has `box-sizing: border-box` which means that padding and border reduce the space for content.
The bottom widget has `box-sizing: content-box` which increases the size of the widget to compensate for padding and border.
=== "Output"
```{.textual path="docs/examples/styles/box_sizing.py"}
```
=== "box_sizing.py"
```python
--8<-- "docs/examples/styles/box_sizing.py"
```
=== "box_sizing.tcss"
```css hl_lines="2 6"
--8<-- "docs/examples/styles/box_sizing.tcss"
```
## CSS
```css
/* Set box sizing to border-box (default) */
box-sizing: border-box;
/* Set box sizing to content-box */
box-sizing: content-box;
```
## Python
```python
# Set box sizing to border-box (default)
widget.box_sizing = "border-box"
# Set box sizing to content-box
widget.box_sizing = "content-box"
```
## See also
- [`border`](./border.md) to add a border around a widget.
- [`padding`](./padding.md) to add spacing around the content of a widget.
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