https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Animations/Using_CSS_animations

Trying to use this

The idea would be after 90 seconds on the home page (or any page as long as it isn’t training material), a giant virtual coach head with a speech bubble “hi!” would slide out from the top right corner of the screen, sit there for 15 seconds, then slide out (and stay  “out” for another 900 seconds or forever, whichever is easier)