Issue with creating background for graph

Hi,

I’m trying to create a background image (test.png) for a graph but it never shows up.
Would be glad a suggestion what is the issue.

import base64
import dash
import dash_core_components as dcc
import dash_html_components as html
import plotly.graph_objects as go

IMAGE_FILENAME1 = 'test.png'
image1 = base64.b64encode(open(IMAGE_FILENAME1, 'rb').read())


fig = go.Figure(
    data=[go.Bar(y=[2, 1, 3])],
    layout_title_text="Native Plotly rendering in Dash"
)

fig.update_layout( images= [dict(
                    #source="KU.png",                    
                    source='data:image/png;base64,{}'.format(image1.decode()),
                    #xref="container",
                    #yref="container",
                    layer="below")])


app = dash.Dash(__name__)

app.layout = html.Div([
    dcc.Graph(id="graph", figure=fig),
])

app.run_server(debug=True)

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