Here are some CSS tooltips examples that you can use.
CSS Tooltip Magic
Dev: Envato Tuts+
CSS ToolTip Smooth animation
Dev: Omar Dsooky
Pure CSS Tooltip
Dev: Cristina Silva
Animated CSS Tooltip Concept
Dev: Sasha
Pure css tooltip with full shadow around
Dev: Vitalii
Pure CSS tooltip
Dev: Rude
Hint- a CSS tooltip library
Dev: Kushagra Gour
Pure CSS Tool Tips and CSS Sprites combined
Dev: Bram de Haan
Emerging Tooltip
Dev: Mikael Ainalem
Social Media Icons with Popups (HTML + Pure CSS Only)
Dev: Abdelrhman Said
Pure CSS 1 element gradient tooltip
Dev: Ana Tudor
The <abbr> element
Dev: Gemma Croad
Tooltip animation
Dev: Milan Raring
Pure CSS Tooltips
Dev: John Fink
Rotating Menu with Submenus
Dev: Burak Can
Sidebar navigation with tooltips
Dev: Daniel
Adaptive Tooltips
Dev: Vladimir
Fancy & Animated Tooltip (CSS Only)
Dev: Reinhard Schnetzinger
Dead Simple Tooltip using Data-Description Attribute
Dev: Jesse Couch
Tooltip Menu Drop Down Awesome
Dev: Virlyz ID
Playful Little Tooltip Ideas
Dev: Andrej Sharapov
ToolTip [Laser Line Effect]
Dev: raj
Custom tooltip (CSS only)
Dev: Marc Wiethe
Tooltip-Arrow with drop shadow
Dev: Roland Lösslein
Form wizard (using bootstrap tabs)
Dev: Luke
Button w/ tooltip
Dev: Fabrizio Cuscini
Single Element Tooltip
Dev: Zoë Bijl
Material fab Pure CSS
Dev: ruslan_khomiak
Friendly Little Tooltips + [Animation]
Dev: Joshua Ward
Pure css tooltip with full shadow around
Dev: Vitalii
Tooltip
Dev: hixann
Tooltip usign just CSS + First letter CSS propriety
Dev: Leandro Fialho
Tooltips
Dev: elhombretecla
Clickable Tooltip
Dev: Jamil Hijjawi
CSS Tooltips
Dev: Ian Farb
Workout App – pure css
Dev: Ivan Grozdic
Tooltiper
Dev: TOMAZKI
Automation Tooltips with Simple Data Attributes
Dev: Adwin
Easy Tooltips
Dev: Matheus Costa
Tooltip
Dev: Matthias Martin
Tooltip Pagination
Dev: Joe
Write JavaScript-less, Dynamic Tooltip Text with CSS
Dev: Julie Horvath
Pure-CSS Tooltips
Dev: Pure-CSS.com
Tooltipster is nice
Dev: Ms Moneypenny
Multicolored font face icons
Dev: Pedro M. S. Duarte
Tooltips Over SVG Social Icons
Dev: Maciej Leszczyński
Tooltip appear
Dev: Mikael Ainalem
Animated CSS Tooltips
Dev: runnabro
Tooltip
Dev: Oleg Shilov