MAGETWO-42871: Storefront menu UI issues on mobile

Author: zanilee

app/design/frontend/Magento/blank/web/css/source/_navigation.less

@@ -86,7 +86,7 @@
             font-size: 1.6rem;
             font-weight: 700;
             margin: 0;
-            padding: 8px 20px;
+            padding: .8rem 3.5rem .8rem 2rem;
             .label {
                 display: block;
                 margin-bottom: @indent__xs;
@@ -133,9 +133,6 @@
                     font-weight: 700;
                     padding: 8px 20px;
                 }
-                &:last-child {
-                    border-bottom: 1px solid @color-gray82;
-                }
             }
             a,
             a:hover {
@@ -217,6 +214,11 @@
                 background: transparent;
                 border-bottom: 0;
             }
+            .nav-sections-item-switch {
+                &:hover {
+                    text-decoration: none;
+                }
+            }
         }
 
         &-item-content {