diff --git a/apps/ai-game-creator-shell/src/styles.css b/apps/ai-game-creator-shell/src/styles.css
index 898602959..eccad2ed7 100644
--- a/apps/ai-game-creator-shell/src/styles.css
+++ b/apps/ai-game-creator-shell/src/styles.css
@@ -5320,6 +5320,41 @@ iframe.preview-frame {
   border-radius: 12px;
 }
 
+.game-resource-book-scene--child::after {
+  position: absolute;
+  z-index: 2;
+  top: 42px;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  border: 1px solid transparent;
+  content: '';
+  pointer-events: none;
+  transition: border-color 180ms ease;
+}
+
+.game-resource-book-scene--child:has(
+    .game-resource-book-scene-card.is-expanded .game-resource-card:hover
+  )
+  .game-resource-book-scene-titlebar.is-active,
+.game-resource-book-scene-titlebar.is-active:hover {
+  border-top-color: #d57b51;
+  border-right-color: #d57b51;
+  border-bottom-color: #ebd9cf;
+  border-left-color: #d57b51;
+}
+
+.game-resource-book-scene--child:has(
+    .game-resource-book-scene-card.is-expanded .game-resource-card:hover
+  )::after,
+.game-resource-book-scene--child:has(
+    .game-resource-book-scene-titlebar.is-active:hover
+  )::after {
+  border-right-color: #d57b51;
+  border-bottom-color: #d57b51;
+  border-left-color: #d57b51;
+}
+
 .game-resource-book-main.is-background,
 .game-resource-canvas.is-background {
   position: absolute;