JSFiddle - React, Tailwind, and code Playground

HTML

<div class="popup_form" style="display: block;">
                            <div class="popup_form_inner">
                                <div class="popup_form_close"></div>
                                <div class="popup_form_title">Оставить  заявку</div>
                               



 <form action="mail.php" enctype="multipart/form-data" method="post">
                                        <div class="form2"><div class="field"><div class="field_title">Введите имя</div><div class="field_description"></div><div class="field_input field_input_text"><input type="text" required="required" name="name" placeholder="Введите имя"></div></div><div class="field"><div class="field_title">Введите E-mail</div><div class="field_description"></div><div class="field_input field_input_email"><input type="email" required="required" name="email" placeholder="Введите E-mail"></div></div><div class="field"><div class="field_title">Введите номер телефона</div><div class="field_description"></div><div class="field_input field_input_phone"><input type="text" required="required" pattern="[+)( .-]*[0-9]+[0-9+)( .-]*" minlength="6" name="phone" placeholder="Введите номер телефона"></div></div><div class="field"><div class="field_input"><input type="submit" class="submit_btn surround" data-action="thanks" data-url="" data-amount="0" data-product_name="undefined" value="Отправить" style="background-color:#084673;    border-radius: 0.39em; ;   "></div></div></div>
                                </form>
                                <div class="popup_form_text">Нажимая на кнопку, Вы принимаете <a target="_blank" href="http://96321.lp.tobiz.net/?personal_data=1">Положение</a> и <a target="_blank" href="http://96321.lp.tobiz.net/?personal_data=2">Согласие</a> на обработку персональных данных.</div>
                            </div>
                    </div>
                    
                    
                    
                    <div class="popup_thanks">
            ...

JavaScript

$.ajax({
                            type: "POST",
                            url: "mail.php",
                            data: formData,
                            async: false,
                            cache: false,
                            contentType: false,
                            processData: false
                        }).done(function (data) {
                            if (data.status == 'OK') {
                                alert(data.msg);
                                this_form.each(function () {
                                    $(this)[0].reset();
                                })
                            }