CSS, the full name is Cascading Style Sheets, is a computer language used to add styles (fonts, spacing and colors, etc.) to structured documents (such as HTML documents or XML applications), and is also the core of beautifying web pages. , CSS is a descriptive style language, so the logic requirements are very low compared to other languages such as C language, and its file extension is .css.
It is still an old habit. The tutorial is equipped with a large number of cases and demos. You can learn and practice at the same time. What you see is what you get, and you can see the skills you have mastered in real time. It is worth reminding that you should first study the HTML tutorial or have a foundation before learning CSS.