Colorscale text size

Hi @vanis,

Here is an example, with a custom colorbar font size and color. For more attributes see https://plot.ly/python/reference/#heatmap-colorbar.

import numpy as np
import plotly.graph_objects as go


z = np.random.rand(10,10)
data = [go.Heatmap(
             z=z, 
             colorscale='Greens', 
             reversescale=True, 
             colorbar=dict(thickness=20,
                           ticklen=3, tickcolor='orange',
                           tickfont=dict(size=14, color='orange')))]
layout = go.Layout(template='none', width=400, height=400, paper_bgcolor='black' )
fig = go.Figure(data=data, layout=layout)

heatmap-tickfont-color

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