._CustomComboBox + .button + ul {
    display: none;
    max-width: initial;    
    max-height: initial;
    overflow: hidden;
    margin: 0px;
    padding: 0px;
    min-width: initial;
    max-width: initial;
}

._CustomComboBox + .button + ul > * {
    margin: 0px;
    padding: 0px;
}