.flag-published-or-reject .flag-action {
background: url(../images/publish.png) no-repeat center center;
border:none;
width: 120px;
height: 25px;
margin-right: 20px;
float: left;
color: transparent;
}
.flag-published-or-reject .unflag-action {
background: url(../images/unpublish.png) no-repeat center center;
border:none;
width: 120px;
height: 25px;
margin-right: 20px;
float: left;
color: transparent;
}
".flag-published-or-reject" is class for flag "flag-published-or-reject".