Reusable CSS patterns help you write less code and keep your design consistent. Tailwind's utility classes are small reusable pieces that you can combine to style elements quickly.
Tailwind uses utility classes like bg-blue-500 for background color, text-white for text color, and p-4 for padding. Other options use invalid class names.
<div class="flex justify-center items-center h-screen"> <div class="w-1/2 p-6 bg-gray-200">Content</div> </div>
The flex container with justify-center and items-center centers the child horizontally and vertically. The child div has half width (w-1/2), padding (p-6), and a gray background (bg-gray-200).
Accessibility means everyone can use your site. Adding aria-label helps screen readers understand the button. Using focus:ring shows a visible focus outline for keyboard users. Removing outlines or hiding buttons harms accessibility.
The md: prefix applies styles at the medium breakpoint, which is 768px and above by default. sm: is smaller screens, lg: and xl: are larger breakpoints.