"Uber for X" brainstorming session Docs HTML Reference MVP.css works with the following HTML elements: <a> — text links <a><b>, <a><strong> — solid link buttons <a><em>, <a><i> — outlined link buttons <article> — content area with normal styling <article><aside> — text callout <blockquote> — quote callout <blockquote><footer> — quote attribution <body> — default parent element <button> — form butt