CSS3 Add to Cart Button

HTML

<link  href="http://fonts.googleapis.com/css?family=Coda+Caption:800" rel="stylesheet" type="text/css" >

<a class="add_to_cart" href="#">Add to cart<span>£5.99</span></a>

CSS

.add_to_cart{
    text-decoration:none;
    padding:8px 18px;
    border:5px solid #e9e9e9;
    //border-radius:40px;
    margin:10px; 
    display:inline-block;
    background-color:#b8d871;
    color:#fff;
  font-family: 'Coda Caption', serif;
    text-transform:uppercase;
    font-size: 16px;
    text-shadow:#838383 1px 1px;
}

.add_to_cart span{
 padding-left:10px;
 border-left:1px solid #e5f1c2;   
}