> For the complete documentation index, see [llms.txt](https://inan.gitbook.io/rich-fx-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://inan.gitbook.io/rich-fx-documentation/effects/others/letterbox.md).

# Letterbox

![Letterbox](/files/-M5mRniuepLw4fhjvJcJ)

This effect draws letterboxes on the edges of the screen according to a particular aspect ratio. You can use it to limit your screen on different display monitors with varying aspect ratios.

| Parameter         | Description                                        |
| ----------------- | -------------------------------------------------- |
| Enabled           | Toggles the effect on/off.                         |
| Color             | Color of the drawn boxes.                          |
| Aspect Ratio Type | Choose the target aspect ratio, or input your own. |