Help How would I go about centering my "contact us" form?

Code
<div class="col-lg-6 col-md-6 col-sm-12 col-xs-12 padding-none">

                    <div class="box-white padding-all">

                        <h2 class="title-border right block-mobile">Contact Form</h2>

                        <div class="data-form">

                        <form action="http://www.locotheme.com/arct-html/post">

                        <div class="row">

                        <div class="col-lg-6 col-md-6 col-sm-12 col-xs-12">

                        <label>Name</label>

                        <div class="form-field">

                        <i class="fa fa-user"></i>

                        <input type="text" name="name" placeholder="Enter your name" required>

                        </div>

                        </div>

                        <div class="col-lg-6 col-md-6 col-sm-12 col-xs-12">

                        <label>E-Mail</label>

                        <div class="form-field">

                        <i class="fa fa-envelope-o"></i>

                        <input type="email" name="name" placeholder="Enter your email" required>

                        </div>

                        </div>

                        </div>

                        <div class="row">

                        <div class="col-lg-6 col-md-6 col-sm-12 col-xs-12">

                        <label>Telephone</label>

                        <div class="form-field">

                        <i class="fa fa-phone"></i>

                        <input type="tel" name="name" placeholder="Enter your telephone" required>

                        </div>

                        </div>

                        <div class="col-lg-6 col-md-6 col-sm-12 col-xs-12">

                        <label>Website</label>

                        <div class="form-field">

                        <i class="fa fa-globe"></i>

                        <input type="url" name="name" placeholder="Enter your website" required>

                        </div>

                        </div>

                        </div>

                        <div class="row">

                        <div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">

                        <label>Message</label>

                        <div class="form-field">

                        <i class="fa fa-pencil-square-o"></i>

                        <textarea name="name" placeholder="Enter your message" required></textarea>

                        </div>

                        </div>

                        </div>

                        <div class="row">

                        <div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">

                        <input type="submit" class="btn btn-dark" value="SEND YOUR MESSAGE">

                        </div>

                        </div>

                        </form>

                        </div>

                    </div>

                </div>[/code]