How do I render template in Flask 3 ?

[Kulin-Soni]

See I had made my whole website on my localhost using flask. Now I want to deploy it on Vercel. How do I link all the files ? Like normally in Flask we have static and templates but if I put it either in api folder and link in index.py or just put them out of the api folder and link like this ../static/index.html it doesn't works. And if I want to link css how to do it ?