关于magento2:How-to-add-tooltip-in-Magento-2

I am using a custom template and just added:

<span class="custom-tooltip">
    <a href="#" class="tooltip-toggle">Test ?</a>
    <span class="tooltip-content">Tolltip description come here</span>
</span>

and than added below style code in my theme styles-l.css

.custom-tooltip {.lib-tooltip(right);
}

and run command below
bin/magento setup:upgrade