The referenced css file, changing the style does not take effect in the browser

1. css syntax error

2. The reason for the browser cache (the previous file style used)

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1. css syntax error

Solution: After checking the grammar is correct, save a few more times

2. The reason for the browser cache (the previous file style used)

Solution: Press F12 in the browser to enter the developer mode, as shown below

 Check to disable the cache, refresh the interface to see the style effect