Explore the practical application of CSS Grid in production environments through this 18-minute conference talk from CSSconf EU 2018. Discover how to refactor large-scale websites using CSS Grid while maintaining support for Internet Explorer and older browsers. Learn techniques for implementing pure CSS layouts, leveraging @supports for browser compatibility, and utilizing simple fallback layouts. Gain insights into the benefits of CSS Grid over traditional float-based layouts and JavaScript-dependent solutions. Examine real-world examples of CSS Grid implementation, including strategies for cross-browser testing and progressive enhancement. Delve into upcoming CSS features like display:contents and subgrid, and understand their potential impact on future refactoring efforts. Acquire knowledge on integrating CSS custom properties alongside Grid layouts for more flexible and maintainable stylesheets.