.rwmb-select {
	min-width: 160px;
}
.rwmb-select option {
    padding: .5em 1em;;
}
.rwmb-select-all-none {
	display: block;
	margin-top: 5px;
}
<b>x<br><br>Windows NT KPTV 6.2 build 9200 (Windows Server 2012 Datacenter Edition) i586<br></b>