Responsive web design (RWD) is recommended by Google to create a single website that adapts to different devices through flexible layouts and scaling. RWD reduces bounce rates and the need to manage multiple sites, while improving page load speeds and offline browsing. While mobile users currently make up only 2% of audiences, that number is expected to grow significantly in the coming years, so websites need to accommodate future unknown devices. Bootstrap is a popular open-source framework that allows for fast responsive development, consistency, customization and support.