diff --git a/cps/static/css/style.css b/cps/static/css/style.css
index 51a70d5f4..2f89a574b 100644
--- a/cps/static/css/style.css
+++ b/cps/static/css/style.css
@@ -1,3 +1,7 @@
+#add-to-shelves.dropdown-menu {
+  max-height: 300px;
+  overflow-y: auto;
+}
 
 .tooltip.bottom .tooltip-inner {
   font-size: 13px;