admin_user_invite_modal.php

<div class="modal" id="userInviteModal" tabindex="-1">
    <div class="modal-dialog">
        <div class="modal-content bg-dark">
            <div class="modal-header">
                <h5 class="modal-title"><i class="fas fa-fw fa-user-plus"></i>Invite User</h5>
                <button type="button" class="close text-white" data-dismiss="modal">
                    <span>&times;</span>
                </button>
            </div>
            <form action="post.php" method="post" enctype="multipart/form-data" autocomplete="off">
                <input type="hidden" name="csrf_token" value="<?php echo $_SESSION['csrf_token'] ?>">
                <div class="modal-body bg-white">

                    <div class="form-group">
                        <label>Email <strong class="text-danger">*</strong></label>
                        <div class="input-group">
                            <div class="input-group-prepend">
                                <span class="input-group-text"><i class="fa fa-fw fa-envelope"></i></span>
                            </div>
                            <input type="email" class="form-control" name="email" placeholder="Email Address" required>
                        </div>
                    </div>

                    <div class="form-group">
                        <label>Role <strong class="text-danger">*</strong></label>
                        <div class="input-group">
                            <div class="input-group-prepend">
                                <span class="input-group-text"><i class="fa fa-fw fa-user-shield"></i></span>
                            </div>
                            <select class="form-control select2" name="role" required>
                                <option value="">- Role -</option>
                                <option value="3">Administrator</option>
                                <option value="2">Technician</option>
                                <option value="1">Accountant</option>
                            </select>
                        </div>
                    </div>

                </div>
                <div class="modal-footer bg-white">
                    <button type="submit" name="invite_user" class="btn btn-primary text-bold"><i class="fas fa-paper-plane mr-2"></i>Send Invite</button>
                    <button type="button" class="btn btn-light" data-dismiss="modal"><i class="fa fa-times mr-2"></i>Cancel</button>
                </div>
            </form>
        </div>
    </div>
</div>