Syntax highlighting not working

[anders-kiaer]

Description
Code is not syntax highlighted.

Expected behavior

Code is syntax highlighted when included using Markdown PageElement.

Actual behavior

No syntax highlight occurs, but looking at the html output from the example below it is almost working:

<pre class="codehilite"><code class="language-python linenums">def hello():
    # This is a comment
    print('Hello World')</code></pre>

How to reproduce

from webviz import Webviz, Markdown

web = Webviz('Main title')

some_content = ("""

# Markdown support

Testing syntax highlighting:

    #!python
    def hello():
        # This is a comment
        print('Hello World')

""")

web.index.add_content(Markdown(some_content))

web.write_html("./webviz_example", overwrite=True, display=True)

Screenshot