.main-menu ul li:last-child a:after{
  content: '';
  background: url("https://rajandrajsilver.com/storage/promotion/icon-new.gif");
    background-repeat: repeat;
  background-repeat: no-repeat;
  width: 42px;
  height: 18px;
  display: inline-block;
  position: absolute;
  top: 6px;
  right: 0;
}