.invalidRule {
    background: url(images/cross.gif) no-repeat 0 50%;
    padding-left:120px;
    line-height:24px;
    color:#ec3f41;
}
.validRule {
     background:url(images/tick.gif) no-repeat 0 50%;
    padding-left:120px;
    line-height:24px;
    color:#3a7d34;
}