This example shows a minimal HTML page that displays the text “Hello kostek” in the center of the browser window. The page uses a plain HTML file with embedded CSS, setting the body’s text alignment to center and a large font size of 13em. It demonstrates the simplest possible web document structure, containing only a DOCTYPE declaration, a head with a title and style block, and a body with a single text node. No JavaScript frameworks or external libraries are used; it relies solely on native HTML and CSS rendering.