I wrote basic code for Python flask, but I got 404 error

from flask import Flask

app = Flask(__name__)
@app.route("/hello")
def hello():
    return "<h1> Hello World! </h1>"

if __name__ == "__main__":
    app.run()`

* Running on http://127.0.0.1:8080/ (Press CTRL+C to quit)
127.0.0.1 - - [26/Sep/2021 23:41:25] "GET / HTTP/1.1" 404 -
127.0.0.1 - - [26/Sep/2021 23:41:25] "GET /favicon.ico HTTP/1.1" 404 -