Fixes broken gradient selector

src/collections/menu.less

@@ -184,27 +184,7 @@
   right: 0px;
   width: 1px;
   height: 100%;
-  background-image: -webkit-linear-gradient(top,
-    rgba(0, 0, 0, 0.05) 0%,
-    rgba(0, 0, 0, 0.1) 50%,
-    rgba(0, 0, 0, 0.05) 100%)
-  ;
-  background-image: -moz-linear-gradient(top,
-    rgba(0, 0, 0, 0.05) 0%,
-    rgba(0, 0, 0, 0.1) 50%,
-    rgba(0, 0, 0, 0.05) 100%)
-  ;
-  background-image: -o-linear-gradient(top,
-    rgba(0, 0, 0, 0.05) 0%,
-    rgba(0, 0, 0, 0.1) 50%,
-    rgba(0, 0, 0, 0.05) 100%)
-  ;
-  background-image: -ms-linear-gradient(top,
-    rgba(0, 0, 0, 0.05) 0%,
-    rgba(0, 0, 0, 0.1) 50%,
-    rgba(0, 0, 0, 0.05) 100%)
-  ;
-  background-image: linear-gradient(top,
+  background-image: linear-gradient(
     rgba(0, 0, 0, 0.05) 0%,
     rgba(0, 0, 0, 0.1) 50%,
     rgba(0, 0, 0, 0.05) 100%)
@@ -1318,27 +1298,27 @@
 
 /*--- Border ---*/
 .ui.inverted.menu .item:before {
-  background-image: -webkit-linear-gradient(top,
+  background-image: -webkit-linear-gradient(
     rgba(255, 255, 255, 0.03) 0%,
     rgba(255, 255, 255, 0.1) 50%,
     rgba(255, 255, 255, 0.03) 100%)
   ;
-  background-image: -moz-linear-gradient(top,
+  background-image: -moz-linear-gradient(
     rgba(255, 255, 255, 0.03) 0%,
     rgba(255, 255, 255, 0.1) 50%,
     rgba(255, 255, 255, 0.03) 100%)
   ;
-  background-image: -o-linear-gradient(top,
+  background-image: -o-linear-gradient(
     rgba(255, 255, 255, 0.03) 0%,
     rgba(255, 255, 255, 0.1) 50%,
     rgba(255, 255, 255, 0.03) 100%)
   ;
-  background-image: -ms-linear-gradient(top,
+  background-image: -ms-linear-gradient(
     rgba(255, 255, 255, 0.03) 0%,
     rgba(255, 255, 255, 0.1) 50%,
     rgba(255, 255, 255, 0.03) 100%)
   ;
-  background-image: linear-gradient(top,
+  background-image: linear-gradient(
     rgba(255, 255, 255, 0.03) 0%,
     rgba(255, 255, 255, 0.1) 50%,
     rgba(255, 255, 255, 0.03) 100%)