diff --git a/public/assets/css/left/left.css b/public/assets/css/left/left.css
index 281600d14d..3f214445d6 100644
--- a/public/assets/css/left/left.css
+++ b/public/assets/css/left/left.css
@@ -14,6 +14,7 @@
 /* left navigation */
 .navbar .left-nav {
       flex: 1;
+      overflow-y: auto;
 }
 .navbar .left-nav > a {
       display: block;
diff --git a/public/assets/css/left/left_mid.css b/public/assets/css/left/left_mid.css
index d9b2beaf65..32a01ed185 100644
--- a/public/assets/css/left/left_mid.css
+++ b/public/assets/css/left/left_mid.css
@@ -17,6 +17,7 @@
 /* left navigation */
 .navbar .left-nav {
       flex: 1;
+      overflow-y: auto;
 }
 .navbar .left-nav > a {
       display: block;
diff --git a/public/assets/css/left/left_small.css b/public/assets/css/left/left_small.css
index e30e49db91..56d84a8744 100644
--- a/public/assets/css/left/left_small.css
+++ b/public/assets/css/left/left_small.css
@@ -17,6 +17,7 @@
 /* left navigation */
 .navbar .left-nav {
       flex: 1;
+      overflow-y: auto;
 }
 .navbar .left-nav > a {
       display: block;