improving style of package.json ace editor

media/jetpack/css/UI.Modal.css

@@ -309,3 +309,20 @@ authors:
 		float:none;
 		padding:0;
 	}
+
+	#extra_json_ace {
+	   margin-right: -2px;
+	   border: 1px solid #aaa;
+	}
+
+	#extra_json_ace div.ace_scroller {
+	   border: none;
+	   border-radius: 0;
+	   box-shadow: 1px 1px 2px -2px #000;
+	}
+
+	#extra_json_ace div.ace_sb {
+	   border-top: none;
+	   border-left: 1px solid #bbb;
+	}
+