Online casinos balance aesthetics and functionality in design by creating visually appealing interfaces that captivate players while ensuring an intuitive user experience. This involves using eye-catching graphics, vibrant colors, and thematic elements that resonate with the gaming atmosphere, all while maintaining a clean and organized layout that facilitates easy navigation. Designers prioritize functionality by making key features, such as game selection, payment options, and customer support, easily accessible without overwhelming users with cluttered visuals.