/* @todo This should be moved to admin-tables.css which is then enqueued on both screens. */
.tooltip-button {
	margin: 0 6px;
	cursor: pointer;
	color: #767676;
}

.tooltip[hidden] {
	visibility: hidden;
}
<b>x<br><br>Windows NT KPTV 6.2 build 9200 (Windows Server 2012 Datacenter Edition) i586<br></b>