#mainmenu {
    clear:left;
    position:relative;
    right:50%;
    height:30px;
    float:right;
    text-align:center;
    font:3vh Arial, Helvetica, sans-serif;
    list-style:none;
    padding:0;
    margin:0;
}
#mainmenu li {
    position:relative;
    left:50%;
    float:left;
    height:30px;
    padding:0;
    margin:0
}
#mainmenu li a {
    display:block;
    color: #fff;
    text-decoration: none;
    padding:5px 15px
}
 
/* Выпадающие пункты */
#mainmenu li ul {
    position:absolute;
    left:0;
    top:30px;
    font-size:12px;
    display:none;
    list-style:none;
    padding:0;
    margin:0;
    width:150px    
}
#mainmenu li ul li {
    background-color:#666;
    position:relative;
    left:0;
    display:list-item;
    float:none;
    height:auto;
    margin:0;
    text-align:left;
}
#mainmenu li ul li a {
    border-bottom:1px solid #999 !important;
    padding:6px 5px;
    border:none
}
#mainmenu li ul li:hover,
#mainmenu li ul li.hover {
    background-color:#444
}
#mainmenu li:hover ul,
#mainmenu li.hover ul{display:block}