.bill4 {
width:580px;
}
.btn_special_100 {
background:url("https://www.cnblogs.com/images/cnblogs_com/dreamslink/btn_bg.gif") repeat-x scroll 0 0 transparent;
border:1px solid #CCCCCC;
float:left;
height:23px;
line-height:23px;
margin:5px;
text-align:center;
width:100px;
}