> For the complete documentation index, see [llms.txt](https://sway-technologies.gitbook.io/sway-charts-pro-scripts-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sway-technologies.gitbook.io/sway-charts-pro-scripts-documentation/sway-charts-pro-user-defined-indicators/notifying-the-user/6.2-changing-the-panel-background-colour.md).

# 6.2	Changing the panel background colour

A UDI can use UDI.setBackground() to change the background colour of its panel, typically as a way of notifying the user of an alert condition. For example:

```
// On some condition which evaluates as an alert…
UDI.setBackground("red");
```

The parameter for UDI.setBackground() can be any valid CSS background colour or style; it is directly setting the style.background of the HTML element which contains the indicator.

 

To remove a background, and revert to the app’s default, you simply pass an empty string:

```
// When the alert is cleared…
UDI.setBackground("");
```