The page starts with "bottom: 100%;" for the initial tooltips and then changes to "bottom: 150%;" when the arrows are added down below to give more room to the arrow. Unfortunately the change in the bottom CSS sample is not shown in the Bottom Arrow example CSS. It should be IMHO.
slight missing instruction on css tooltip page
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On this page about CSS tooltips:
https://www.w3schools.com/css/css_tooltip.asp
The page starts with "bottom: 100%;" for the initial tooltips and then changes to "bottom: 150%;" when the arrows are added down below to give more room to the arrow. Unfortunately the change in the bottom CSS sample is not shown in the Bottom Arrow example CSS. It should be IMHO.
Thanks.