diff --git a/src/index.css b/src/index.css
index ffd49cc..bf4a21e 100644
--- a/src/index.css
+++ b/src/index.css
@@ -422,6 +422,8 @@ html, body, #root {
   padding: 12px; display: flex; flex-direction: column; gap: 12px;
   min-height: 0; /* Allow flex item to shrink below content — enables scrolling */
 }
+/* Prevent sidebar children from shrinking — forces overflow → scroll */
+.gm-puzzle-sidebar > * { flex-shrink: 0; }
 
 .gm-puzzle-canvas-wrap {
   flex: 1; position: relative; overflow: hidden;