docs/python_docs/themes/mx-theme/mxtheme/header_sourcelink.html

{%- if display_github %}
<a id="button-show-github"
    href="https://{{ github_host|default("github.com") }}/{{ github_user }}/{{ github_repo }}/{{ theme_vcs_pageview_mode|default("edit") }}/{{ github_version }}{{ conf_py_path }}{{ pagename }}{{ page_source_suffix }}" class="mdl-button mdl-js-button mdl-button--icon">
<i class="material-icons">edit</i>
</a>
<div class="mdl-tooltip" data-mdl-for="button-show-github">
{{ _('Edit on Github') }}
</div>
{%- elif show_source and has_source and sourcename %}
<a id="button-show-source"
    class="mdl-button mdl-js-button mdl-button--icon"
    href="{{ pathto('_sources/' + sourcename, true)|e }}" rel="nofollow">
  <i class="material-icons">code</i>
</a>
<div class="mdl-tooltip" data-mdl-for="button-show-source">
{{ _('Show Source') }}
</div>
{%- endif %}