<div>
    <form class="needs-validation" novalidate>
        <div class="form-group">
            <label for="exampleFormControlTextarea1">Product No.：</label>
            <textarea product-nums-txt name="cstProductNo" class="form-control" id="exampleFormControlTextarea1" rows="5" required></textarea>
            <input type="hidden" name="type" value="1">
            <div class="invalid-feedback">         
                  please enter Product No.       
            </div>
        </div>
        <div class="form-group">
            <label for="exampleFormControlName">Name：</label>
            <input type="text" name="cstName" class="form-control" id="exampleFormControlName" required>
        </div>
        <div class="form-group">
            <label for="exampleFormControlPhone">Telephone：</label>
            <input type="text" name="cstPhone" class="form-control" id="exampleFormControlPhone" required>
        </div>
        <div class="form-group">
            <label for="exampleFormControlInput1">Email：</label>
            <input type="email" name="cstEmail" class="form-control" id="exampleFormControlInput1" placeholder="name@example.com" required>
        </div>
        <div class="form-group">
            <label for="exampleFormControlCity">Enterprise Name：</label>
            <input type="text" name="cstCity" class="form-control" id="exampleFormControlCity" required>
        </div>
        <div class="form-group">
            <label for="exampleFormControlUsefor">Application purpose：</label>
            <input type="text" name="usedFor" class="form-control" id="exampleFormControlUsefor" required>
        </div>
       

        <div class="">
            <button class="btn btn-info" type="submit" value="Submit" style="margin-right: 5rem">Submit</button>
            <button class="btn btn-secondary" type="reset" value="Reset">Reset</button>
        </div>
    </form>
</div>