fix legend margin collapse

bootstrap.css

@@ -6,7 +6,7 @@
  * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Designed and built with all the love in the world @twitter by @mdo and @fat.
- * Date: Thu Jan 26 15:25:02 PST 2012
+ * Date: Thu Jan 26 15:39:24 PST 2012
  */
 article,
 aside,
@@ -475,7 +475,6 @@ legend {
   color: #333333;
   border: 0;
   border-bottom: 1px solid #eee;
-  -webkit-margin-collapse: separate;
 }
 label,
 input,
@@ -918,7 +917,8 @@ input:focus:required:invalid:focus, textarea:focus:required:invalid:focus, selec
   margin-bottom: 9px;
 }
 .form-horizontal legend + .control-group {
-  padding-top: 27px;
+  margin-top: 18px;
+  -webkit-margin-top-collapse: separate;
 }
 .form-horizontal .control-group {
   margin-bottom: 18px;