You can use css like this:
.woocommerce form .form-row.validate-required.woocommerce-invalid .chzn-drop, .woocommerce form .form-row.validate-required.woocommerce-invalid .chzn-single, .woocommerce form .form-row.validate-required.woocommerce-invalid input.input-text, .woocommerce form .form-row.validate-required.woocommerce-invalid select, .woocommerce-page form .form-row.validate-required.woocommerce-invalid .chzn-drop, .woocommerce-page form .form-row.validate-required.woocommerce-invalid .chzn-single, .woocommerce-page form .form-row.validate-required.woocommerce-invalid input.input-text, .woocommerce-page form .form-row.validate-required.woocommerce-invalid select, .woocommerce-error {
border-color: red;
}
.woocommerce form .form-row .required, .woocommerce-page form .form-row .required, .woocommerce-error:before {
color:red;
}
Kadence Themes