diff --git a/theme/styleguide.css b/theme/styleguide.css
index 8403cc1db..20ad8666d 100644
--- a/theme/styleguide.css
+++ b/theme/styleguide.css
@@ -202,6 +202,7 @@ h4 {
 
 .Frame-panel--sidebar {
   background-color: white;
+  min-width: 280px !important;
 }
 
 .Code pre {