Hi Saeed
Add the following to the Custom CSS field of your templates parameters. This will reduce your menu height to 45px (default 50px)...
#container_hornav .wrapper960 {
height: 45px;
}
#hornav > ul > li > a {
padding: 10px 20px;
}
#hornav .menu li [class^="fa-"]:before, #hornav .menu li [class*=" fa-"]:before {
top: 13px;
}
Ciarán