Style menu in Header region

Add the following code to your .css file,

/*
* Header menu
*/
.region-header ul.menu li { float:left; display:block; overflow:hidden; list-style-type:none; padding:0 10px; margin:0; border-right:1px solid #6a87a3;  }

.region-header ul.menu li.first { padding:0 10px 0 0; }

.region-header ul.menu li.last { border-right:none; }

I also committed this code.

Fixed and committed.