Combining long gradients and hard transition gradients within a single shape was used in creating this beveled bar. In addition, because this is a PowerPoint shape, it can become a combination graphic element, and text box.
The bevel effect is created with a set of tight/hard stops on the far left and right. The bevel bar is created with 8 color stops.
Download a slide with the Beveled Callout Bar here.
Troy @ TLC