An application displaying primary content, such as a webpage, may include unused space. The unused space may exist within the application displaying the primary content (e.g., within the browser window), or on other portions of the display (e.g., outside of the browser window). The unused space is identified and leveraged to display secondary content on the client display along with the primary content. The secondary content may be adaptable to conform to different sizes and/or configurations of the unused space. The secondary content may be updated as the user interacts with elements on the client display.