Pressable CSS3 Social Buttons

<div class="container">  
  <span class="button fb">  
  <a href="#"><img src="http://png-1.findicons.com/files/icons/2052/social_network/32/facebook.png" alt="">Like It</a>  
  </span>  
   
  <span class="button twit">  
  <a href="#"><img src="http://png-4.findicons.com/files/icons/2192/flavour_extended/48/twitter_standing.png" alt="">Tweet It</a>  
  </span>  
   
  <span class="button mail">  
  <a href="#"><img src="http://png-1.findicons.com/files/icons/1696/once/48/mail.png" alt="">Email</a>  
  </span>  
  </div>

body {
  background: #f1f1f1;
}

a{  
  text-decoration: none;  
  color:#333333;  
}  
   
.container{  
  width: 420px;  
  margin: 50px auto 50px; /* buttons pushed from the top by 10% */  
}  

.button{  
  margin: 8px;  
}  

.button a{  
  font-family: arial, sans-serif;
  font-size: 13px;  
  color: #777;
  text-shadow: 1px 1px 0px white;
  background: #ffffff; /* Old browsers */  
  background: -moz-linear-gradient(top, #ffffff 0%, #dfdfdf 100%); /* FF3.6+ */  
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ffffff), color-stop(100%,#dfdfdf)); /* Chrome,Safari4+ */  
  background: -webkit-linear-gradient(top, #ffffff 0%,#dfdfdf 100%); /* Chrome10+,Safari5.1+ */  
  background: -o-linear-gradient(top, #ffffff 0%,#dfdfdf 100%); /* Opera11.10+ */  
  background: -ms-linear-gradient(top, #ffffff 0%,#dfdfdf 100%); /* IE10+ */  
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#dfdfdf',GradientType=0 ); /* IE6-9 */  
  background: linear-gradient(top, #ffffff 0%,#dfdfdf 100%); /* W3C */  
  -moz-border-radius: 3px;  
  -webkit-border-radius: 3px;  
  border-radius: 3px;  
  -moz-box-shadow: 0 1px 3px 0px rgba(0,0,0,0.4);  
  -webkit-box-shadow: 0 1px 3px 0px rgba(0,0,0,0.4);  
  box-shadow: 0 1px 3px 0px rgba(0,0,0,0.4);  
  padding: 6px 12px;  
}  

.button a:hover{  
  background: #ffffff; /* Old browsers */  
  background: -moz-linear-gradient(top, #ffffff 0%, #eee 100%); /* FF3.6+ */  
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ffffff), color-stop(100%,#eee)); /* Chrome,Safari4+ */  
  background: -webkit-linear-gradient(top, #ffffff 0%,#eee 100%); /* Chrome10+,Safari5.1+ */  
  background: -o-linear-gradient(top, #ffffff 0%,#eee 100%); /* Opera11.10+ */  
  background: -ms-linear-gradient(top, #ffffff 0%,#eee 100%); /* IE10+ */  
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#eee',GradientType=0 ); /* IE6-9 */  
  background: linear-gradient(top, #ffffff 0%,#eee 100%); /* W3C */  
  -moz-box-shadow: 0 1px 3px 0px rgba(0,0,0,0.4);  
  -webkit-box-shadow: 0 1px 3px 0px rgba(0,0,0,0.4);  
  box-shadow: 0 1px 3px 0px rgba(0,0,0,0.4);  
}  

.button a:active{  
  background: #dfdfdf; /* Old browsers */  
  background: -moz-linear-gradient(top, #dfdfdf 0%, #f1f1f1 100%); /* FF3.6+ */  
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#dfdfdf), color-stop(100%,#f1f1f1)); /* Chrome,Safari4+ */  
  background: -webkit-linear-gradient(top, #dfdfdf 0%,#f1f1f1 100%); /* Chrome10+,Safari5.1+ */  
  background: -o-linear-gradient(top, #dfdfdf 0%,#f1f1f1 100%); /* Opera11.10+ */  
  background: -ms-linear-gradient(top, #dfdfdf 0%,#f1f1f1 100%); /* IE10+ */  
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#dfdfdf', endColorstr='#f1f1f1',GradientType=0 ); /* IE6-9 */  
  background: linear-gradient(top, #dfdfdf 0%,#f1f1f1 100%); /* W3C */  

  -webkit-box-shadow: 0px 1px 1px 1px rgba(0,0,0,0.2) inset, 0px 1px 1px 0 rgba(255,255,255,1);
  -moz-box-shadow: 0px 1px 1px 1px rgba(0,0,0,0.2) inset, 0px 1px 1px 0 rgba(255,255,255,1);  
  box-shadow: 0px 1px 1px 1px rgba(0,0,0,0.2) inset, 0px 1px 1px 0 rgba(255,255,255,1);  

}

.button a > img{  
  padding-right: 8px;  
  position: relative;  
  top: 2px;  
}