Use the following code as a template for displaying a Google+ Share button.

Default Google+ Share button

<div class="a2a_kit a2a_default_style">
    <a class="a2a_button_google_plus_share"></a>
</div>

<script type="text/javascript" src="http://static.addtoany.com/menu/page.js"></script>

Custom Google+ Share button

Each Google+ Share button is independently customizable by specifying any Google+ Share button attribute as a data attribute. For example, you can change the annotation of the button to a vertical bubble, target a specific URL to share, and much more.

<div class="a2a_kit">
    <a class="a2a_button_google_plus_share" data-annotation="vertical-bubble" data-href="http://example.com/"></a>
</div>

<script type="text/javascript" src="http://static.addtoany.com/menu/page.js"></script>