diff --git a/CHANGES b/CHANGES
index bda3637e01b..6abe4d8f145 100644
--- a/CHANGES
+++ b/CHANGES
@@ -23,6 +23,7 @@ Incompatible changes
   To migrate: either add an explicit inventory name to the references
   intersphinx should resolve, or explicitly set the value of this configuration
   variable to an empty list.
+* #10197: html theme: Reduce ``body_min_width`` setting in basic theme to 360px
 * #9999: LaTeX: separate terms from their definitions by a CR (refs: #9985)
 * #10062: Change the default language to ``'en'`` if any language is not set in
   ``conf.py``
diff --git a/sphinx/themes/basic/theme.conf b/sphinx/themes/basic/theme.conf
index 45834f000f2..f8e7b263c16 100644
--- a/sphinx/themes/basic/theme.conf
+++ b/sphinx/themes/basic/theme.conf
@@ -7,7 +7,7 @@ sidebars = localtoc.html, relations.html, sourcelink.html, searchbox.html
 [options]
 nosidebar = false
 sidebarwidth = 230
-body_min_width = 450
+body_min_width = 360
 body_max_width = 800
 navigation_with_keys = False
 enable_search_shortcuts = True