from flask import Flask

app = Flask(__name__)


@app.route("/")
def hello_world():
    return '<h1 style="text-align: center">Hello, World!</h1>' \
           '<p>This is a paragraph</p>'


@app.route("/bye")
def say_bye():
    return "Bye!"


@app.route("/username/<name>/<int:number>")
def greet(name, number):
    return f"Hello there {name}, you are {number} years old!"


if __name__ == "__main__":
    app.run(debug=True)
