.input-validation-error {
    border: 1px solid #ff0000 !important;
    /*background-color: #ffeeee;*/
}

    .input-validation-error[readonly] {
        border: 1px solid #ff0000 !important;
        /*background-color: #ffeeee;*/
    }

    .input-validation-error + .select2-container > span.selection > span.select2-selection {
        border-color: #dc3545 !important;
    }