dropdown.css

.ui-button-dropdown {
    position: relative;
    display: inline-block;
    *display: inline;
    *zoom: 1;
}

.ui-button-dropdown-large,
.ui-button-dropdown-middle,
.ui-button-dropdown-small {
    border: 1px solid #ddd;
    border-top: none;
    border-bottom: none;
    box-shadow: 0 0 4px #d9d9d9;
    zoom: 1;
    position: absolute;
    left: 0;
    width: 98%;
    background: #fff;
    margin: 0;
    padding: 0;
    list-style: none;
}
.ui-button-dropdown-large {
    top: 33px;
    font-size: 14px;    
}
.ui-button-dropdown-middle {
    top: 29px;
    font-size: 14px;    
}
.ui-button-dropdown-small {
    top: 25px;
    font-size: 12px;
}
.ui-button-dropdown-item {
    zoom: 1;
    border-bottom: 1px solid #E6E6E6;    
}
.ui-button-dropdown-item a {
    padding: 5px 10px;
    display: block;
    zoom: 1;
    color: #08c;
}
.ui-button-dropdown-item a:hover {
    background-color: #DFE9F2;
    text-decoration:none;
}