Pure CSS Google+ Button

Inspired by http://forrst.com/posts/Share_buttons-IOa

HTML

<div id="container">
    
    <h1>Pure CSS Share Buttons</h1>
    <p>Inspired by <a href="http://forrst.com/posts/Share_buttons-IOa" target="_blank">Ionut Zamfir</a></p>

    <div class="social twitter">
        <span>853</span>
        <a href="#"><b>Tweet</b></a>
    </div>
    
    <div class="social facebook">
        <span>432</span>
        <a href="#"><b>Like</b></a>
    </div>
    
    <div class="social google">
        <span>224</span>
        <a href="#"><b>+1</b></a>
    </div>
    
</div>

CSS

body {
    background: #e6e6e6...