diff --git a/css/styles.css b/css/styles.css
index d1712fb1..94291383 100644
--- a/css/styles.css
+++ b/css/styles.css
@@ -159,6 +159,7 @@ radio {
 }
 .overamp trough highlight {
   background: @error_color;
+  border-color: @error_color;
 }
 
 /* Elapsed Popover */