line height of tool text

I have added a class to the tool tip.
[su_tooltip style=”cluetip” position=”north” shadow=”no” rounded=”no” size=”2″ title=”my title” content=”my content here” behavior=”hover” close=”no” class=”tooltip”]View Tooltip[/su_tooltip]

and added the css to the settings on page:
/wp-admin/admin.php?page=shortcodes-ultimate-settings

.tooltip {line-height: 2.5 !important;}

This has no effect on line height. And the default line height does not change when size is increased.

Please assist! Thank you for the plugin.