I created a website on which we can add candidates and select their positions from a dropdown menu in a modal. It works fine as a website but I wanted to convert it into an application with PHPDesktop-Chrome. The rest of the functions works fine but the dropdown lists are not working i.e., the list does not open after clicking.

<div class="form-group">
    <label for="position" class="col-sm-3 control-label">Position</label>

    <div class="col-sm-9">
        <select class="form-control dropdown-toggle" id="position" name="position" required>
            <option value="" selected>- Select -</option>
            <?php
                $sql = "SELECT * FROM positions";
                $query = $conn->query($sql);
                while($row = $query->fetch_assoc()){
                    echo "
                        <option value='".$row['id']."'>".$row['description']."</option>
                    ";
                }
            ?>
        </select>
    </div>
</div>