I am having issues centering a div class in the footer of my WordPress website (using a CPO theme). 

I want to call the variable I created in HTML and format it using the additional CSS in the theme of my WordPress site. 

After creating div class example I want to use auto margins to center the logo using CSS

```css
#example {
  margin-left: auto ;
  margin-right: auto ;
}
```

```html
<div class="example">     
  <div class="ctwg-social">
    <a class="ctwg-social-link ctwg-social-facebook" href="https://www.facebook.com/example" title="Facebook"><span class="ctwg-social-icon"></span></a>
  </div>
</div> 
```

I've also tried calling `<class id="example">` but that didnt work either.