I have a Get in Touch button on the bottom of this page:

In the mobile version (less than 770px) of the site I would like it to be centered.

HTML:

```
<div class="white, home_contact_btn wpb_column vc_column_container vc_col-sm-4">
    <div class="wpb_wrapper">
        <a class="laborator-btn btn btn-index-1 btn-type-standard  contact-btn btn-primary btn-normal" target="" title="GET IN CONTACT" href="http://www.estiponagroup.com/dev/contact/">GET IN TOUCH</a>
    </div>
</div>

```

CSS

```
.home_contact_btn a{
    margin:0 auto;
    text-align:center;
}

```