css相关的练习网站http://flexboxfroggy.com/http://learnlayout.com/https://github.com/olton/Metro-UI-CSShttps://purecss.io/常见的css检查https://github.com/thedaviddias/Front-End-Checklisthttps://github.com/thedaviddias/Front-End-Performance-Checklist常用css布局方式布局技法:https://www.jianshu.com/p/cb415fa1014ehttps://blog.csdn.net/zhang6223284/article/details/81909600https://blog.csdn.net/m0_38134431/article/details/84372226布局实例:http://www.sweet-kk.top/css-layout-demo/html/index.htmlhttps://www.sweet-kk.top/css-layout/#/