Update file conf.py

docs/source/conf.py

@@ -30,5 +30,7 @@ language = 'german'
 # -- Options for HTML output -------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
 
-html_theme = 'alabaster'
+# html_theme = 'alabaster'
+html_theme = 'sphinx_rtd_theme' # 'alabaster'
+
 html_static_path = ['_static']