#main-menu ul li {
    float: left;
    position: relative;
    list-style: none;
    width: 138.57px;
    text-align: center;
    font-size: 14px;
    font-family: Microsoft Yahei;
    z-index: 12;
}

#main-menu ul li ul {
    position: absolute;
    background-color: #444;
    top: 36px;
    left: 0px;
    padding: 0px;
    width: 138.57px;
    margin: 0px;
    border-top: 1px solid #B0B0B0;}