Css Sheet not working in Jupyter notebook

Hello, I am working on Jupyter Notebook and i am trying to use an external css sheet for a Dash app
but i get the error above, Forgive me if it’s something very obvious as i am very new to this.

import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output
from jupyter_plotly_dash import JupyterDash

external_stylesheets = ["https://codepen.io/chriddyp/pen/bWLwgP.css"]

app = JupyterDash(__name__, external_stylesheets=external_stylesheets)

app.layout = html.Div([
    dcc.Input(id='my-id', value='initial value', type='text'),

    Output(component_id='my-div', component_property='children'),
    [Input(component_id='my-id', component_property='value')]
def update_output_div(input_value):
    return 'You\'ve entered "{}"'.format(input_value)


Out: TypeError: __init__() got an unexpected keyword argument 'external_stylesheets'