diff --git a/public/css/firefly.css b/public/css/firefly.css
index 2762b01073..b1224ebcdc 100644
--- a/public/css/firefly.css
+++ b/public/css/firefly.css
@@ -126,4 +126,10 @@ span.info-box-icon a {
 span.info-box-text a:hover, span.info-box-number a:hover {
     color: #000;
     text-decoration: underline;
+}
+
+.dropdown-menu {
+    max-height: 300px;
+    overflow-y: auto;
+    overflow-x: hidden;
 }
\ No newline at end of file