positioning menu

Hope someone can help, trying to position menu to align middle, see screenshot attached. Would this be in my css? See extract from css below:

[ Moderator note: Code fixed, please wrap code in backticks or use the code button. ]

/* Nav Menu */

#topnav {
    margin: 0;
    list-style-type: none;
    overflow: visible;
    position: relative;
    padding: 0;
    float: right;
    font-family: 'Open Sans', Arial, sans-serif !important;
}

.sf-menu a {
    text-decoration: none;
    display: block;
    position: relative;
    padding: 0px 0 0 28px;
}

.sf-menu > li {
    position: relative;
}

/* Drop down menu */

.sf-menu ul a:hover {}

.sf-menu li li {
    text-align: left;
    line-height: 20px;
    margin: 0;
}

.sf-menu, .sf-menu * {
    margin: 0;
    padding: 0;
    list-style: none;
    font-size: 13px;
}

.sf-menu {
    line-height: 100%;
    position: absolute;
    right: 0;
    bottom: 0;
    float: left;
}

.sf-menu ul {
    position: absolute;
    top: -999em;
    width: 12em;
 /* left offset of submenus need to match (see below) */;
}

.sf-menu ul li {
    width: 100%;
}

.sf-menu li:hover {
    visibility: inherit;
 /* fixes IE7 'sticky bug' */;
}

.sf-menu li {
    float: left;
    position: relative;
    margin: 0px 0px 10px 0px;
    z-index: 999;
}

.sf-menu li:hover ul,

.sf-menu li.sfHover ul {
    left: -5px;
    top: 4.7em; /* match top ul list item height */
    z-index: 999;
    padding: 0 15px;
}

ul.sf-menu li:hover li ul,
ul.sf-menu li.sfHover li ul {
    top: -999em;
}

ul.sf-menu li li:hover ul,
ul.sf-menu li li.sfHover ul {
    left: 11.2em!important; /* match ul width */
    top: -1px;
    margin-left: 0px;
}

ul.sf-menu li li:hover li ul,
ul.sf-menu li li.sfHover li ul {
    top: -999em;
}

ul.sf-menu li li li:hover ul,
ul.sf-menu li li li.sfHover ul {
    left: 12em;
 /* match ul width */
    top: -1px;
}

.sf-menu ul li a {
    padding: 5px 0px!important;
    font-size: 13px;
}

.sf-menu li ul {
    padding: 0px 0px;
}

.sf-menu a.sf-with-ul {
    min-width: 1px;
 /* trigger IE7 hasLayout so spans position accurately */;
}

.sf-sub-indicator {
    position: absolute;
    display: block;
    right: 10px;
    top: 1.05em;
 /* IE6 only */
    width: 10px;
    height: 10px;
    text-indent: -999em;
    overflow: hidden;
}

.sf-menu ul {
    border: 0px;
}

.sf-menu li li {
}

.sf-menu > li li:before {
    content: "";
    display: block;
}

.sf-menu > li li:first-child:before {
    border: 0;
}