modules/app.py

from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse

app = FastAPI()

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


@app.head("/")
@app.get("/")
def index() -> FileResponse:
    return FileResponse(path="/index.html", media_type="text/html")