diff --git a/apps/remix-ide/src/assets/css/themes/remix-night_owl.css b/apps/remix-ide/src/assets/css/themes/remix-night_owl.css
index 43ae099198..1090c0c9d8 100644
--- a/apps/remix-ide/src/assets/css/themes/remix-night_owl.css
+++ b/apps/remix-ide/src/assets/css/themes/remix-night_owl.css
@@ -33,7 +33,7 @@
   --theme-background-input: #234d708c;
   --theme-background: #011627;
   --theme-background-panels: #011628;
-  --theme-border-tab: 1px solid #7fdbca;
+  --theme-border-tab: 1px solid #7fdbca52;
   --theme-ace-identifier: #ffcb8bcc;
   --theme-ace-operator: #ffcb8b;
   --theme-ace-symbols: #7fdbca;