This example presents a simple interactive webpage built with vanilla JavaScript and the Document Object Model (DOM). It shows a centered royal blue interface where a message and number display change color in response to button clicks. The code uses `document.querySelector` and `classList.toggle` to switch CSS style classes on the message, buttons, and number element. No external libraries or data sources are used; the HTML, inline CSS, and JavaScript module work together to create the visual, with an image fixed to the corner for decoration.