alfresco-ng2-components/lib/insights/analytics-process/components/widgets/dropdown/dropdown.widget.scss

.adf-dropdown-widget {
    width: 100%;
}

.adf-dropdown-widget__select {
    width: 100%;
}

.adf-dropdown-widget__invalid .adf-dropdown-widget__select {
    border-color: #d50000;
}

.adf-dropdown-widget__invalid .adf-dropdown-widget__label {
    color: #d50000;
}

.adf-dropdown-widget__invalid .adf-dropdown-widget__label::after {
    background-color: #d50000;
}