Stylesheet not applied

Hi,

When I view the HTML using Live Server on VS Code, the stylesheet is applied.

However, when I open the HTML file from my folder, the stylesheet is not applied.

Similarly, after committing and pushing the source files to a repo and using HTML preview on github, the stylesheet is not applied. Could anyone assist on this?

Repo link: https://github.com/luveshsadhwani/renewmalaysia
HTML Preview: https://htmlpreview.github.io/?https://github.com/luveshsadhwani/renewmalaysia/blob/128f6dbe751f51bdc56a409513903872cc3be93a/index.html