Update histograms.md

Author: LiamConnors

doc/python/histograms.md

@@ -8,7 +8,7 @@ jupyter:
       format_version: '1.3'
       jupytext_version: 1.14.1
   kernelspec:
-    display_name: Python 3 (ipykernel)
+    display_name: Python 3
     language: python
     name: python3
   language_info:
@@ -20,7 +20,7 @@ jupyter:
     name: python
     nbconvert_exporter: python
     pygments_lexer: ipython3
-    version: 3.8.0
+    version: 3.8.8
   plotly:
     description: How to make Histograms in Python with Plotly.
     display_as: statistical
@@ -113,10 +113,8 @@ snippet_url = 'https://python-docs-dash-snippets.herokuapp.com/python-docs-dash-
 IFrame(snippet_url + 'histograms', width='100%', height=1200)
 ```
 
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+<div style="font-size: 0.9em;"><div style="width: calc(100% - 30px); box-shadow: none; border: thin solid rgb(229, 229, 229);"><div style="padding: 5px;"><div><p><strong>Sign up for Dash Club</strong> → Free cheat sheets plus updates from Chris Parmer and Adam Schroeder delivered to your inbox every two months. Includes tips and tricks, community apps, and deep dives into the Dash architecture.
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 #### Accessing the counts (y-axis) values