html - I have white line when I hover over menu item in my navigation -

i working on website , have problem because when hover on menu item, drop down menu item in navigation drop down appears white line across 2 menu items appears on menu item , next one. don't know happening. here code navigation ( using genesis framework wordpress)

.genesis-nav-menu {  	border: none;  	color: #919594;  	display: block;  	font-size: 14px;  	padding: 20px;  	position: relative;  	top: 35px;  }    .genesis-nav-menu a:hover,  .genesis-nav-menu .current-menu-item > a,  .genesis-nav-menu .sub-menu .current-menu-item > a:hover {  	color: #c77d3c;  	border: 2px solid #c77d3c;  	border-radius: 12px;  }

your .site-header .sub-menu has border-top. if remove one, removed page.

i can see have commented out in css-file, it's being applied. why applied mystery you'll have solve yourself. @ least know comes :)