The direct reason is that it cannot be loaded css/main.css
The reason why it cannot be loaded is that the address he requested is https://2youngg.github.io/css/main.css It should be https://2youngg.github.io/Test01/css/main.css
Solution In config.yml, there is a field similar to base_url, which is set to https://2youngg.github.io/Test01/
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The direct reason is that it cannot be loaded
css/main.cssThe reason why it cannot be loaded is that the address he requested is
https://2youngg.github.io/css/main.css
It should be
https://2youngg.github.io/Test01/css/main.css
Solution
In config.yml, there is a field similar to base_url, which is set to
https://2youngg.github.io/Test01/