diff --git a/themes/atom-light-ui/tabs.css b/themes/atom-light-ui/tabs.css
index f5ebd6ef9..7bdba5938 100644
--- a/themes/atom-light-ui/tabs.css
+++ b/themes/atom-light-ui/tabs.css
@@ -68,12 +68,14 @@
 }
 
 .tab.active:before {
+  left: -5px;
   border-bottom-right-radius: 4px;
   border-width: 0 1px 1px 0;
   box-shadow: 2px 2px 0 #e5e5e5;
 }
 
 .tab.active:after {
+  right: -5px;
   border-bottom-left-radius: 4px;
   border-width: 0 0 1px 1px;
   box-shadow: -2px 2px 0 #e5e5e5;