# alpha parameter (skin)

Source: https://ref.dm-lang.org/skin/param/alpha

### Applies to
> [Main](https://ref.dm-lang.org/skin/control/main.md) (window only)

### Format
> `number`

### Default value
> 255

Opacity of the window, from 0 (invisible) to 255 (opaque).

### See also
> [transparent-color parameter](https://ref.dm-lang.org/skin/param/transparent-color.md)