#twitter_aria{
margin:10px 0px;
padding-bottom:10px;
border:1px solid #76ccff;
}

#twitter_botton{
margin:10px 49px 0px 49px;
height:20px;
width:80px;
}

a .tb{
background: url(/common/pc/img/shopping/twitter/tweet_ja.png) no-repeat;
display:block;
height:20px;
width:80px;
overflow:hidden;
}

a:hover .tb{
background-position: 0 -21px;
}

a:active .tb{
background-position: 0 -42px;
}