练习网站模板
https://support.microsoft.com/zh-cn/help/13768/desktop-themes-featured
好知识，WEB前端
http://www.cnblogs.com/lhb25/
在线IDE
https://www.jdoodle.com/
https://csharppad.com/
http://rextester.com/
https://dotnetfiddle.net/
javascript 在线编辑器
https://codesandbox.io/
看下：
https://jupyter-notebook.readthedocs.io/en/stable/public_server.html