client/securedrop_client/gui/base/dialog_message.css

#ModalDialog_error_details {
    margin: 0px 40px 0px 36px;
    font-family: 'Montserrat';
    font-size: 16px;
    color: #ff0064;
}

#ModalDialog_error_details_active {
    margin: 0px 40px 0px 36px;
    font-family: 'Montserrat';
    font-size: 16px;
    color: #ff66c4;
}