app.py

from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles
from fastapi.responses import HTMLResponse
from fastapi.templating import Jinja2Templates
from fastapi.responses import FileResponse

app = FastAPI()
app.mount("/static", StaticFiles(directory="static", html=True), name="static")

@app.get("/")
async def root():
    return FileResponse("static/index.html")