commit 835bb2be9e00c50e5751d271380ac00fe98f8d07

Author: Karolina Surma <33810531+befeleme@users.noreply.github.com>

Date:   Tue Jun 15 18:47:42 2021

    Replace call to add_stylesheet with add_css_file

    This should prevent documentation build failures with Sphinx 4.

diff --git a/docs/source/conf.py b/docs/source/conf.py

index c3f6e2f..ab160e1 100644

--- a/docs/source/conf.py

+++ b/docs/source/conf.py

@@ -38,7 +38,7 @@ extensions = [

 ]

 def setup(app):

-    app.add_stylesheet("hack.css")

+    app.add_css_file("hack.css")

 intersphinx_mapping = {

     "sphinx": ("http://www.sphinx-doc.org/en/stable/", None),