15.1.560. tablet_qt/resources/camcops/stylesheets/validatinglineedit.css

*[valid="true"] {
    /* "green" ends up as emerald green for some reason */
    background-color: rgb(0, 255, 0);
    color: rgb(0, 0, 0);
}

*[invalid="true"] {
    background-color: rgb(255, 0, 0);
    color: rgb(255, 255, 255);
}

#validatorfeedbackdark {
    color: black;
}