SCSS seems like not working.

I followed the instruction in https://www.allanlab.org/aboutwebsite.html, fork the repo to my account. But when I open my own website, the site is just like picture below. Is there any mistake I make? Thanks for reply!
<img width="1440" alt="截屏2024-10-24 12 00 09" src="https://github.com/user-attachments/assets/6557150c-7210-43b6-9c8a-caa7b3c4e543">
