The css code has been modified, but when running the program, the content of the source code css is still a long time ago and has not been updated at all. Is this a deterrent?
3
0
0
Browser cache. Use ctrl+F5 to refresh the page
Browser cache. Set the browser developer mode to disable caching.
If it is chrome, it is as shown below, other browsers are similar. 
You need to turn on Flask's debugging mode, set the debug parameter to True, and everything will be fine.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
