27. Responsive Design
As most of the users are using mobile for web browsing nowadays, the responsive design become mush more important for boosting user experience. By adjusting the layout according to the size of screen, users can enjoy the same efficiency and readability of the website with different devices. By using @media rule, we can adjust the layout in a flexible way. Also, during development stage, we can make use of the browser tools to check the layout on different devices.
