Mobile responsiveness is crucial as many users shop using mobile devices. A responsive design ensures the website looks and functions well on all screen sizes, providing a seamless shopping experience. Sites that aren't mobile-friendly risk losing potential sales and can even be penalized in search engine rankings. According to Statista, approximately 72.9% of all retail e-commerce is expected to be generated via mobile commerce by the end of 2021. A responsive design ensures the site functions optimally on all device sizes, providing a consistent shopping experience. Non-responsive sites risk losing a substantial portion of potential sales.