.custom-combobox
{
    position: relative;
    display: inline-block;
}

.ComboBoxText
{
    border-spacing: 0 !important;
}

.ComboboxButton
{
    height: 20px !important;
    width: 15px !important;
    top: -1px;
}

.DropDownListComboBox {

}

.ui-autocomplete {
    height: 200px; 
    overflow-y: scroll;
    z-index: 1100 !important;
}
.ui-menu {
    max-width: 500px !important;
}