A layout example approximating a multi-step sign-up UI from Dribbble shots, using a flexbox layout for a split-screen interface. The left sidebar contains page numbers and a bottom section with step details plus a progress bar made of four rounded divs, while the right side is an empty flex-grow area. The code uses plain HTML and CSS, including `display: flex`, `flex-direction: column`, `justify-content: space-between`, and `flex-grow` to arrange the elements. No external libraries are used, and the markup is static with no interaction or data binding.