src/ccDarkTheme/components/inputs/_dropdown-select.scss

material-dropdown-select dropdown-button {
  color: var(--TWPT-primary-text)!important;
}

material-dropdown-select dropdown-button .button.is-disabled .button-text,
    material-dropdown-select dropdown-button .button.is-disabled material-icon {
  color: rgba(255, 255, 255, .32)!important;
}