fixed?

.atom/packages/atom-material-ui/styles/nav.less

@@ -1,26 +0,0 @@
-.nav-tabs {
-    border-bottom: 1px solid @base-border-color;
-
-    li {
-        &.active a,
-        a {
-            border: none;
-            margin-right: 0;
-            margin-bottom: 1px;
-        }
-
-        &.active a,
-        &.active a:hover,
-        a:hover {
-            background-color: @background-color-highlight;
-            border: none;
-            color: @text-color-selected;
-            border-bottom-left-radius: 0;
-            border-bottom-right-radius: 0;
-        }
-
-        &.active a {
-            background-color: @tab-background-color-active;
-        }
-    }
-}