Prompt: Description: Design a header image that resembles a real decibel meter, taking the shape of a fan. The primary color tone should be #485065, and a gradient effect can be applied for a richer overall appearance. In the image, the fan shape can represent the measurement range of decibels, while the color gradient conveys a modern and appealing look for the application. At the center of the fan shape, you can add a visually striking decibel icon to highlight the main feature of the application.