Hint.css
A CSS only tooltip library for your lovely websites
...All you need to do is give your element any position class and tooltip text using the aria-label attribute. Note, if you don't want to use aria-label attribute, you can also specify the tooltip text using the data-hint attribute, but its recommended to use aria-label in support of accessibility. If you are already using v1.x, you may need to tweak certain position classes because of the way tooltips are positioned in v2.