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README.md

@@ -9,7 +9,7 @@
 
 A simple UI toolkit for .NET, .NET Core, and Mono that works on Windows, the Mac, and Linux/Unix.
 
-![Sample app](https://raw.githubusercontent.com/migueldeicaza/gui.cs/master/docfx/sample.png)
+![Sample app](https://raw.githubusercontent.com/migueldeicaza/gui.cs/master/docfx/sample.gif)
 
 ## Controls & Features