Make .form-horizontal simple with less CSS classes

vendors/bootstrap/less/close.less

@@ -9,22 +9,10 @@
   font-weight: bold;
   line-height: @baseLineHeight;
   color: inherit;
+  cursor: pointer;
+  text-decoration: none;
   text-shadow: 0 1px 0 rgba(255,255,255,1);
-  opacity: 0.5;
-  &:hover {
-    text-decoration: none;
-    cursor: pointer;
-    opacity: 0.8;
+  &:not(:hover) {
+    opacity: 0.5;
   }
 }
-
-// Additional properties for button version
-// iOS requires the button element instead of an anchor tag.
-// If you want the anchor version, it requires `href="#"`.
-button.close {
-  padding: 0;
-  cursor: pointer;
-  background: transparent;
-  border: 0;
-  -webkit-appearance: none;
-}