怎么写高效的css
https://thenextweb.com/news/writing-efficient-css-understand-your-selectors
https://programmerinnervoice.wordpress.com/2013/12/18/how-does-browser-read-css-selector/
https://stackoverflow.com/questions/5797014/why-do-browsers-match-css-selectors-from-right-to-leftt
Don’t Use Inline-Styles
Avoid the !important tag
https://www.freecodecamp.org/news/7-important-tips-for-writing-better-css/
https://csswizardry.com/2011/09/writing-efficient-css-selectors/