On feature pages and Pricing, each section below the top of the page is shown as a framed panel, and lists within a section become grids of panels. In the app, the sections of each page sit in one framed column, Your tools on the Dashboard show their tool colours, and the sidebar shows each tool's two-letter mark in its colour. The homepage sections are also wider.
Website admins can preview the design, or show it to everyone, from Admin > Site design. Until it is shown to everyone, visitors and members see the current design.