Welcome to the book "Responsive Design". In this book, I'll introduce you to all the CSS functions you need to create a responsive design. By responsive design, I mean that the website adapts its styles to the display device. So your application changes its layout, alignment, font size, images and even applies different styles for different screen sizes. For example, on wide screens such as TVs, it will display horizontally, while on mobile devices it will switch to a vertical layout. The functions of Responsive CSS include modern layouts such as Flex. This includes media queries, responsive typography and responsive images. It is not possible to list every single detail of all the features in a book, because then the book would be so extensive and you would get bored reading it. There is a wealth of information everywhere. So I'll keep it simple and tell you what you need for your project and try to get you on the right track. Let's go