Need help building website using sveltekit and sveltia cms

hello

I am building a website written with sveltekit, tailwindCss, sveltia cms and deploying to vercel. However, I am having difficulty logging into sveltia cms. Specifically, I cannot configure oauth and when accessing the url/admin it cannot login through my github. The website is located in the /site/htdocs/ directory and the bug is in the admin section. I really hope you can help me solve this problem. Thanks, I hope to receive help from the community. If you are interested you can check out my repo here