diff --git a/themes/atom-dark-ui/tabs.css b/themes/atom-dark-ui/tabs.css
index 7a3d8b394..81b52334e 100644
--- a/themes/atom-dark-ui/tabs.css
+++ b/themes/atom-dark-ui/tabs.css
@@ -4,7 +4,7 @@
   box-shadow: inset 0 -1px 0 #2e2e2e, 0 1px 0 #191919;
 }
 
-.is-focused .tab {
+.tab {
   background-image: -webkit-linear-gradient(#444, #3d3d3d);
   border-top: 1px solid #383838;
   border-right: 1px solid #2e2e2e;
@@ -12,38 +12,16 @@
   box-shadow: inset 0 0 5px #383838, 0 1px 0 #585858, inset -1px 0 0 #4a4a4a, inset 1px 0 0 #4a4a4a;
 }
 
-.is-focused .tab:first-child {
+ .tab:first-child {
   box-shadow: inset 0 0 5px #383838, 0 1px 0 #585858, inset -1px 0 0 #4a4a4a;
 }
 
-.is-focused .tab.active,
-.is-focused .tab.active:hover {
-  border-top: 1px solid #4a4a4a;
-  box-shadow: inset -1px 0 0 #595959, inset 1px 0 0 #595959;
-  border-bottom-color: #424242;
-  background-image: -webkit-linear-gradient(#555555, #424242);
-}
-
-.tab {
-  background-color: #555;
-  background-image: none;
-  border-top: 1px solid #383838;
-  border-right: 1px solid #2e2e2e;
-  border-bottom: 1px solid #2e2e2e;
-  box-shadow: inset 0 0 5px #555, 0 1px 0 #585858, inset -1px 0 0 #4a4a4a, inset 1px 0 0 #4a4a4a;
-}
-
-.tab:first-child {
-  box-shadow: inset 0 0 5px #555, 0 1px 0 #585858, inset -1px 0 0 #4a4a4a;
-}
-
 .tab.active,
 .tab.active:hover {
   border-top: 1px solid #4a4a4a;
   box-shadow: inset -1px 0 0 #595959, inset 1px 0 0 #595959;
   border-bottom-color: #424242;
-  background-image: none;
-  background-color: #424242;
+  background-image: -webkit-linear-gradient(#555555, #424242);
 }
 
 .tab,
@@ -55,9 +33,9 @@
   border-color: #aaa;
 }
 
-.is-focused .tab.active,
-.is-focused .tab.active:hover,
-.is-focused .tab.active .close-icon {
+.tab.active,
+.tab.active:hover,
+.tab.active .close-icon {
   color: #e6e6e6;
 }
 
@@ -74,8 +52,8 @@
   border: 3px solid #777;
 }
 
-.is-focused .tab.active:first-child,
-.is-focused .tab.active:first-child:hover {
+.tab.active:first-child,
+.tab.active:first-child:hover {
   box-shadow: inset -1px 0 0 #595959;
 }
 
@@ -84,18 +62,6 @@
   border: 1px solid #595959;
 }
 
-.is-focused .tab.active:before {
-  border-bottom-right-radius: 4px;
-  border-width: 0 1px 1px 0;
-  box-shadow: 2px 2px 0 #424242;
-}
-
-.is-focused .tab.active:after {
-  border-bottom-left-radius: 4px;
-  border-width: 0 0 1px 1px;
-  box-shadow: -2px 2px 0 #424242;
-}
-
 .tab.active:before {
   border-bottom-right-radius: 4px;
   border-width: 0 1px 1px 0;
@@ -104,6 +70,7 @@
 
 .tab.active:after {
   border-bottom-left-radius: 4px;
+  border-width: 0 0 1px 1px;
   box-shadow: -2px 2px 0 #424242;
 }