diff --git a/docs/source/conf.py b/docs/source/conf.py
index bfafc108ea93a4231ca783cb794e743dbde2ce3d..c161dbfde9a29bd18b8849cd9ac1d604ea50b252 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -30,7 +30,8 @@ templates_path = ['_templates']
 
 # -- Options for HTML output
 
-html_theme = 'sphinx_rtd_theme'
+# html_theme = 'sphinx_book_theme'
+html_theme = 'classic'
 
 # -- Options for EPUB output
 epub_show_urls = 'footnote'
@@ -41,4 +42,4 @@ html_theme_options = {
       {"name": "link-one-name", "url": "https://<link-one>"},
       {"name": "link-two-name", "url": "https://<link-two>"}
   ]
-}
\ No newline at end of file
+}