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textual/docs/styles/layer.md
darrenburns 9e883d3e45 Document styles (#785)
* Add docs for CSS variables

* Add ref docs for various styles, fix some typos in places
2022-09-15 16:32:23 +01:00

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# Layer
The `layer` property is used to assign widgets to a layer.
The value of the `layer` property must be the name of a layer defined using a `layers` declaration.
Layers control the order in which widgets are painted on screen.
More information on layers can be found in the [guide](../guide/layout.md#layers).
## Syntax
```
layer: <STRING>;
```
## Example
In the example below, `#box1` is yielded before `#box2`.
However, since `#box1` is on the higher layer, it is drawn on top of `#box2`.
[//]: # (NOTE: the example below also appears in the guide and 'layers.md'.)
=== "Output"
```{.textual path="docs/examples/guide/layout/layers.py"}
```
=== "layers.py"
```python
--8<-- "docs/examples/guide/layout/layers.py"
```
=== "layers.css"
```sass hl_lines="3 15 19"
--8<-- "docs/examples/guide/layout/layers.css"
```
## CSS
```sass
/* Draw the widget on the layer called 'below' */
layer: below;
```
## Python
```python
# Draw the widget on the layer called 'below'
widget.layer = "below"
```