Page ROller
This example shows a looping CSS animation of four rotating lines that form a rolling square shape. The animation uses custom keyframes named `desno`, `desno2`, and `desno3` to rotate each line sequentially around different origins, with staggered opacity changes creating the illusion of a continuous page-turning effect. The code relies on CSS transforms, animation properties, and positioning, with the lines styled as rounded rectangles in a yellow-green palette on a green background. While the HTML includes an SVG element and D3.js, the visual effect is driven entirely by CSS.