I find the reason is the .css or .js file can't be load. I have tried several ways, so lucky, I find a way. 1."win+R", input ‘cmd’，so we get in this 2. we input'ping github.global.ssl.fastly.net' then it will show like this. 3.modify your hosts file, add this 188.8.131.52 github.global.ssl.fastly.net 4.when I get in github.com, it works.
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