Change default font in sphinx documentation

Create your own "_templates" directory and "layout.html" file (assuming you build from a "source" directory):

$ mkdir source/_templates
$ touch source/_templates/layout.html

Configure your "conf.py":

templates_path = ['_templates']
html_static_path = ['_static']

Override file "source/_templates/layout.html":

{# Import the theme's layout. #}
{% extends "!layout.html" %}

{# Custom CSS overrides #}
{% set bootswatch_css_custom = ['_static/my-styles.css'] %}

In _static/my-styles.css:

body{
    font-family:"Arial", Helvetica, sans-serif;
}

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