Yet another attempt to reset safari styles

media/less/sign/sign.less

@@ -12,10 +12,10 @@
     }
 }
 
-input#signin_b {
+input[type="button"] {
     -webkit-appearance: none;
-    -webkit-border-radius: 5px;
-    border-radius: 5px;
+    -webkit-border-radius: 0px;
+    border-radius: 0px;
 }
 
 h2 {