diff --git a/ui/src/assets/common.scss b/ui/src/assets/common.scss
index 2ba3830..886fc03 100644
--- a/ui/src/assets/common.scss
+++ b/ui/src/assets/common.scss
@@ -264,6 +264,7 @@
   // Override top level overflow: hidden so height of this flex item can be
   // its content height.
   overflow: visible;
+  border-bottom: 1px solid #262f3c;
 }
 
 // In the scrolling case, since the canvas is overdrawn and continuously