diff --git a/assets/less/layout.less b/assets/less/layout.less
index 5e5e89ef8..57749267b 100644
--- a/assets/less/layout.less
+++ b/assets/less/layout.less
@@ -21,6 +21,7 @@ body {
 .main {
   .display(flex);
   justify-content: flex-end;
+  height: 100%;
 }
 
 .sidebar {