Flash, originally developed by Macromedia, began as a platform for Web-based animation, but over the years has become a dominant way to deliver multimedia content for computers, smartphones and tablets, and other devices. Adobe Flash is the basis for streaming video in the FLV format on sites like YouTube and can be used to create 2D animation, interactive games and Internet applications. The stage in Flash is the canvas on which Flash animations play out, and can be sized and colored based on the project.
Open Adobe Flash CS4. Click "File," then "New." Select "Flash File (Actionscript 3.0)." Click "OK."
Click "Modify." Click "Document."
Click the box next to "Background Color" in the Document Properties window. Use the dropper tool to select a new color for the stage. You can also type in a hexadecimal value for a color if you want to exactly match the color of the Flash stage to the background color of a Web page. Click "OK."