.flag {
    width: 16px;
    height: 11px;
    background:url(../images/flags.png) no-repeat
}

.os {
    width: 16px;
    height: 16px;
    background:url(../images/os.png) no-repeat
}

.uas {
    width: 16px;
    height: 16px;
    background:url(../images/uas.png) no-repeat
}